chore: initialize repository with gitignore

.gitignore

@@ -0,0 +1,32 @@
+# OS files
+.DS_Store
+Thumbs.db
+
+# IDE/editor
+.idea/
+*.iml
+.vscode/
+
+# Logs
+*.log
+
+# Gradle
+.gradle/
+**/.gradle/
+build/
+**/build/
+out/
+
+# Java/Kotlin compiled files
+*.class
+
+# Android local and generated files
+local.properties
+**/local.properties
+captures/
+.externalNativeBuild/
+.cxx/
+
+# Temporary files
+tmp/
+**/tmp/

hw1/.gitattributes

@@ -0,0 +1,12 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
+# Binary files should be left untouched
+*.jar           binary
+

hw1/.gitignore

@@ -0,0 +1,5 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build

hw1/app/build.gradle

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+plugins {
+    id 'application'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation libs.junit.jupiter
+
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+    implementation libs.guava
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+application {
+    mainClass = 'triangle.App'
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
+}

hw1/app/src/main/java/triangle/App.java

@@ -0,0 +1,50 @@
+package triangle;
+
+public class App {
+
+    public enum TriangleType {
+        EQUILATERAL,  // 等边三角形
+        ISOSCELES,    // 等腰三角形
+        SCALENE,      // 一般三角形
+        NOT_A_TRIANGLE // 非三角形
+    }
+
+    public static TriangleType classify(int a, int b, int c) {
+        // 检查边长是否为正整数
+        if (a <= 0 || b <= 0 || c <= 0) {
+            return TriangleType.NOT_A_TRIANGLE;
+        }
+
+        // 检查三角不等式（任意两边之和大于第三边）
+        // 使用 long 防止整数溢出
+        if ((long) a + b <= c || (long) a + c <= b || (long) b + c <= a) {
+            return TriangleType.NOT_A_TRIANGLE;
+        }
+
+        // 判断三角形类型
+        if (a == b && b == c) {
+            return TriangleType.EQUILATERAL;
+        } else if (a == b || b == c || a == c) {
+            return TriangleType.ISOSCELES;
+        } else {
+            return TriangleType.SCALENE;
+        }
+    }
+
+    public static void main(String[] args) {
+        if (args.length != 3) {
+            System.out.println("用法: java triangle.App <边1> <边2> <边3>");
+            return;
+        }
+        int a = Integer.parseInt(args[0]);
+        int b = Integer.parseInt(args[1]);
+        int c = Integer.parseInt(args[2]);
+        TriangleType result = classify(a, b, c);
+        switch (result) {
+            case EQUILATERAL -> System.out.println("等边三角形");
+            case ISOSCELES -> System.out.println("等腰三角形");
+            case SCALENE -> System.out.println("一般三角形");
+            case NOT_A_TRIANGLE -> System.out.println("非三角形");
+        }
+    }
+}

hw1/app/src/test/java/triangle/AppTest.java

@@ -0,0 +1,208 @@
+package triangle;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.DisplayName;
+import static org.junit.jupiter.api.Assertions.*;
+import triangle.App.TriangleType;
+
+class AppTest {
+
+    // ========================================================================
+    // 等价类划分
+    // ========================================================================
+    //
+    // 输入条件: 三个整数 a, b, c 作为三角形的三条边
+    //
+    // 有效等价类:
+    //   EC1: 等边三角形 (a=b=c, 且 a>0)
+    //   EC2: 等腰三角形 (恰好两边相等, 且满足三角不等式)
+    //   EC3: 一般三角形 (三边互不相等, 且满足三角不等式)
+    //
+    // 无效等价类:
+    //   EC4: 某边为 0
+    //   EC5: 某边为负数
+    //   EC6: 两边之和等于第三边 (退化三角形)
+    //   EC7: 两边之和小于第三边 (不满足三角不等式)
+    //   EC8: 整数溢出边界 (极大值)
+    //
+    // ========================================================================
+
+    // --- 有效等价类测试 ---
+
+    @Test
+    @DisplayName("EC1: 等边三角形 - 三边相等")
+    void testEquilateral() {
+        assertEquals(TriangleType.EQUILATERAL, App.classify(5, 5, 5));
+    }
+
+    @Test
+    @DisplayName("EC2a: 等腰三角形 - a=b≠c")
+    void testIsoscelesABEqual() {
+        assertEquals(TriangleType.ISOSCELES, App.classify(5, 5, 3));
+    }
+
+    @Test
+    @DisplayName("EC2b: 等腰三角形 - a=c≠b")
+    void testIsoscelesACEqual() {
+        assertEquals(TriangleType.ISOSCELES, App.classify(5, 3, 5));
+    }
+
+    @Test
+    @DisplayName("EC2c: 等腰三角形 - b=c≠a")
+    void testIsoscelesBCEqual() {
+        assertEquals(TriangleType.ISOSCELES, App.classify(3, 5, 5));
+    }
+
+    @Test
+    @DisplayName("EC3: 一般三角形 - 三边互不相等")
+    void testScalene() {
+        assertEquals(TriangleType.SCALENE, App.classify(3, 4, 5));
+    }
+
+    // --- 无效等价类测试 ---
+
+    @Test
+    @DisplayName("EC4a: 第一边为0")
+    void testZeroSideA() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(0, 5, 5));
+    }
+
+    @Test
+    @DisplayName("EC4b: 第二边为0")
+    void testZeroSideB() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(5, 0, 5));
+    }
+
+    @Test
+    @DisplayName("EC4c: 第三边为0")
+    void testZeroSideC() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(5, 5, 0));
+    }
+
+    @Test
+    @DisplayName("EC5a: 第一边为负数")
+    void testNegativeSideA() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(-1, 5, 5));
+    }
+
+    @Test
+    @DisplayName("EC5b: 第二边为负数")
+    void testNegativeSideB() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(5, -1, 5));
+    }
+
+    @Test
+    @DisplayName("EC5c: 第三边为负数")
+    void testNegativeSideC() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(5, 5, -1));
+    }
+
+    @Test
+    @DisplayName("EC6a: a+b=c 退化三角形")
+    void testDegenerateABEqualC() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(1, 2, 3));
+    }
+
+    @Test
+    @DisplayName("EC6b: a+c=b 退化三角形")
+    void testDegenerateACEqualB() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(1, 3, 2));
+    }
+
+    @Test
+    @DisplayName("EC6c: b+c=a 退化三角形")
+    void testDegenerateBCEqualA() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(3, 1, 2));
+    }
+
+    @Test
+    @DisplayName("EC7a: a+b<c 不满足三角不等式")
+    void testInequalityViolationC() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(1, 2, 10));
+    }
+
+    @Test
+    @DisplayName("EC7b: a+c<b 不满足三角不等式")
+    void testInequalityViolationB() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(1, 10, 2));
+    }
+
+    @Test
+    @DisplayName("EC7c: b+c<a 不满足三角不等式")
+    void testInequalityViolationA() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(10, 1, 2));
+    }
+
+    @Test
+    @DisplayName("EC8: 极大整数值边界")
+    void testMaxIntOverflow() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(Integer.MAX_VALUE, 1, 1));
+    }
+
+    // ========================================================================
+    // 边界值分析 补充测试用例
+    // ========================================================================
+    //
+    // 边界: 边长最小有效值 1, 以及三角不等式的临界点
+    //
+
+    @Test
+    @DisplayName("BV1: 最小等边三角形 (1,1,1)")
+    void testMinEquilateral() {
+        assertEquals(TriangleType.EQUILATERAL, App.classify(1, 1, 1));
+    }
+
+    @Test
+    @DisplayName("BV2: 最小等腰三角形 (1,1,2) -> 退化, 非三角形")
+    void testMinIsoscelesDegenerate() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(1, 1, 2));
+    }
+
+    @Test
+    @DisplayName("BV3: 等腰三角形刚好满足不等式 (2,2,3)")
+    void testIsoscelesJustValid() {
+        assertEquals(TriangleType.ISOSCELES, App.classify(2, 2, 3));
+    }
+
+    @Test
+    @DisplayName("BV4: 一般三角形刚好满足不等式 (2,3,4)")
+    void testScaleneJustValid() {
+        assertEquals(TriangleType.SCALENE, App.classify(2, 3, 4));
+    }
+
+    @Test
+    @DisplayName("BV5: 一般三角形不等式临界 a+b=c+1 (3,4,6)")
+    void testScaleneBoundary() {
+        assertEquals(TriangleType.SCALENE, App.classify(3, 4, 6));
+    }
+
+    @Test
+    @DisplayName("BV6: 大等边三角形 (MAX,MAX,MAX)")
+    void testLargeEquilateral() {
+        assertEquals(TriangleType.EQUILATERAL, App.classify(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE));
+    }
+
+    @Test
+    @DisplayName("BV7: 三边全为0")
+    void testAllZero() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(0, 0, 0));
+    }
+
+    @Test
+    @DisplayName("BV8: 三边全为负数")
+    void testAllNegative() {
+        assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(-1, -1, -1));
+    }
+
+    @Test
+    @DisplayName("BV9: 边长为1的一般三角形边界 (1,2,2) 等腰")
+    void testSmallIsosceles() {
+        assertEquals(TriangleType.ISOSCELES, App.classify(1, 2, 2));
+    }
+
+    @Test
+    @DisplayName("BV10: 大值等腰三角形溢出检测")
+    void testLargeIsoscelesOverflow() {
+        assertEquals(TriangleType.ISOSCELES, App.classify(Integer.MAX_VALUE, Integer.MAX_VALUE, 1));
+    }
+}

hw1/gradle.properties

@@ -0,0 +1,2 @@
+org.gradle.configuration-cache=true
+

hw1/gradle/libs.versions.toml

@@ -0,0 +1,7 @@
+[versions]
+guava = "33.4.6-jre"
+junit-jupiter = "5.12.1"
+
+[libraries]
+guava = { module = "com.google.guava:guava", version.ref = "guava" }
+junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit-jupiter" }

hw1/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

hw1/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

hw1/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

hw1/settings.gradle

@@ -0,0 +1,6 @@
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '1.0.0'
+}
+
+rootProject.name = 'triangle'
+include('app')

hw2/app/build.gradle

@@ -0,0 +1,29 @@
+plugins {
+    id 'application'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation libs.junit.jupiter
+
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+    implementation libs.guava
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+application {
+    mainClass = 'login.LoginValidator'
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
+}

hw2/app/src/main/java/login/LoginValidator.java

@@ -0,0 +1,57 @@
+package login;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class LoginValidator {
+
+    public static List<String> validate(String account, String password) {
+        List<String> messages = new ArrayList<>();
+
+        boolean accountValid = isAccountValid(account);
+        boolean passwordValid = isPasswordValid(password);
+
+        if (accountValid && passwordValid) {
+            messages.add("输入合法");
+        } else {
+            if (!accountValid) {
+                messages.add("账号不合法");
+            }
+            if (!passwordValid) {
+                messages.add("密码不合法");
+            }
+        }
+
+        return messages;
+    }
+
+    /**
+     * 账号合法：6-10位自然数（纯数字，不含负号/小数点，长度6~10）
+     */
+    static boolean isAccountValid(String account) {
+        if (account == null) return false;
+        int len = account.length();
+        if (len < 6 || len > 10) return false;
+        for (char c : account.toCharArray()) {
+            if (c < '0' || c > '9') return false;
+        }
+        return true;
+    }
+
+    /**
+     * 密码合法：恰好8位字符串（非null，长度==8）
+     */
+    static boolean isPasswordValid(String password) {
+        if (password == null) return false;
+        return password.length() == 8;
+    }
+
+    public static void main(String[] args) {
+        if (args.length != 2) {
+            System.out.println("用法: java login.LoginValidator <账号> <密码>");
+            return;
+        }
+        List<String> result = validate(args[0], args[1]);
+        result.forEach(System.out::println);
+    }
+}

hw2/app/src/test/java/login/LoginValidatorTest.java

@@ -0,0 +1,212 @@
+package login;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.DisplayName;
+import static org.junit.jupiter.api.Assertions.*;
+import java.util.List;
+
+class LoginValidatorTest {
+
+    // ========================================================================
+    // 因果图分析
+    // ========================================================================
+    //
+    // 原因 (Causes):
+    //   C1: 账号长度 >= 6
+    //   C2: 账号长度 <= 10
+    //   C3: 账号为纯数字（自然数）
+    //   C4: 密码长度 = 8
+    //
+    // 中间节点:
+    //   M1 = C1 ∧ C2 ∧ C3  (账号合法)
+    //
+    // 结果 (Effects):
+    //   E1: 显示"输入合法"     ← M1 ∧ C4
+    //   E2: 显示"账号不合法"   ← ¬M1
+    //   E3: 显示"密码不合法"   ← ¬C4
+    //
+    // ========================================================================
+    // 判定表简化后的 4 条规则 → 测试用例
+    // ========================================================================
+    //
+    // | 规则 | 账号合法(M1) | 密码合法(C4) | 预期结果               |
+    // |------|-------------|-------------|------------------------|
+    // | R1   | T           | T           | 输入合法               |
+    // | R2   | T           | F           | 密码不合法             |
+    // | R3   | F           | T           | 账号不合法             |
+    // | R4   | F           | F           | 账号不合法 + 密码不合法 |
+    //
+
+    // --- 规则 R1: 账号合法 ∧ 密码合法 → 输入合法 ---
+
+    @Test
+    @DisplayName("R1: 账号合法(6位数字) + 密码合法(8位) → 输入合法")
+    void testR1_validAccountAndPassword() {
+        List<String> result = LoginValidator.validate("123456", "abcd1234");
+        assertEquals(List.of("输入合法"), result);
+    }
+
+    @Test
+    @DisplayName("R1 变体: 账号10位数字 + 密码8位 → 输入合法")
+    void testR1_account10Digits() {
+        List<String> result = LoginValidator.validate("1234567890", "pass$12#");
+        assertEquals(List.of("输入合法"), result);
+    }
+
+    @Test
+    @DisplayName("R1 变体: 账号8位数字(中间值) + 密码8位 → 输入合法")
+    void testR1_accountMiddleLength() {
+        List<String> result = LoginValidator.validate("12345678", "Pa55w0rd");
+        assertEquals(List.of("输入合法"), result);
+    }
+
+    // --- 规则 R2: 账号合法 ∧ 密码不合法 → 密码不合法 ---
+
+    @Test
+    @DisplayName("R2: 账号合法 + 密码过短(7位) → 密码不合法")
+    void testR2_passwordTooShort() {
+        List<String> result = LoginValidator.validate("123456", "abcd123");
+        assertEquals(List.of("密码不合法"), result);
+    }
+
+    @Test
+    @DisplayName("R2 变体: 账号合法 + 密码过长(9位) → 密码不合法")
+    void testR2_passwordTooLong() {
+        List<String> result = LoginValidator.validate("123456", "abcd12345");
+        assertEquals(List.of("密码不合法"), result);
+    }
+
+    @Test
+    @DisplayName("R2 变体: 账号合法 + 密码为空 → 密码不合法")
+    void testR2_passwordEmpty() {
+        List<String> result = LoginValidator.validate("123456", "");
+        assertEquals(List.of("密码不合法"), result);
+    }
+
+    // --- 规则 R3: 账号不合法 ∧ 密码合法 → 账号不合法 ---
+
+    @Test
+    @DisplayName("R3a: 账号过短(5位) + 密码合法 → 账号不合法 [C1为假]")
+    void testR3_accountTooShort() {
+        List<String> result = LoginValidator.validate("12345", "abcd1234");
+        assertEquals(List.of("账号不合法"), result);
+    }
+
+    @Test
+    @DisplayName("R3b: 账号过长(11位) + 密码合法 → 账号不合法 [C2为假]")
+    void testR3_accountTooLong() {
+        List<String> result = LoginValidator.validate("12345678901", "abcd1234");
+        assertEquals(List.of("账号不合法"), result);
+    }
+
+    @Test
+    @DisplayName("R3c: 账号含非数字字符 + 密码合法 → 账号不合法 [C3为假]")
+    void testR3_accountNonNumeric() {
+        List<String> result = LoginValidator.validate("12345a", "abcd1234");
+        assertEquals(List.of("账号不合法"), result);
+    }
+
+    @Test
+    @DisplayName("R3d: 账号为空 + 密码合法 → 账号不合法")
+    void testR3_accountEmpty() {
+        List<String> result = LoginValidator.validate("", "abcd1234");
+        assertEquals(List.of("账号不合法"), result);
+    }
+
+    // --- 规则 R4: 账号不合法 ∧ 密码不合法 → 账号不合法 + 密码不合法 ---
+
+    @Test
+    @DisplayName("R4a: 账号过短 + 密码过短 → 账号不合法 + 密码不合法")
+    void testR4_bothInvalid_shortShort() {
+        List<String> result = LoginValidator.validate("123", "abc");
+        assertEquals(List.of("账号不合法", "密码不合法"), result);
+    }
+
+    @Test
+    @DisplayName("R4b: 账号过长 + 密码过长 → 账号不合法 + 密码不合法")
+    void testR4_bothInvalid_longLong() {
+        List<String> result = LoginValidator.validate("12345678901", "abcde12345");
+        assertEquals(List.of("账号不合法", "密码不合法"), result);
+    }
+
+    @Test
+    @DisplayName("R4c: 账号含字母 + 密码为空 → 账号不合法 + 密码不合法")
+    void testR4_bothInvalid_nonNumericEmpty() {
+        List<String> result = LoginValidator.validate("abcdef", "");
+        assertEquals(List.of("账号不合法", "密码不合法"), result);
+    }
+
+    // ========================================================================
+    // 补充: 覆盖各个原因条件的边界情况
+    // ========================================================================
+
+    @Test
+    @DisplayName("边界: 账号恰好6位(下界) + 密码8位")
+    void testBoundary_account6() {
+        List<String> result = LoginValidator.validate("100000", "12345678");
+        assertEquals(List.of("输入合法"), result);
+    }
+
+    @Test
+    @DisplayName("边界: 账号恰好10位(上界) + 密码8位")
+    void testBoundary_account10() {
+        List<String> result = LoginValidator.validate("1000000000", "12345678");
+        assertEquals(List.of("输入合法"), result);
+    }
+
+    @Test
+    @DisplayName("边界: 账号5位(下界-1) + 密码8位")
+    void testBoundary_account5() {
+        List<String> result = LoginValidator.validate("10000", "12345678");
+        assertEquals(List.of("账号不合法"), result);
+    }
+
+    @Test
+    @DisplayName("边界: 账号11位(上界+1) + 密码8位")
+    void testBoundary_account11() {
+        List<String> result = LoginValidator.validate("10000000001", "12345678");
+        assertEquals(List.of("账号不合法"), result);
+    }
+
+    @Test
+    @DisplayName("边界: 密码恰好8位")
+    void testBoundary_password8() {
+        List<String> result = LoginValidator.validate("123456", "12345678");
+        assertEquals(List.of("输入合法"), result);
+    }
+
+    @Test
+    @DisplayName("边界: 密码7位(8-1)")
+    void testBoundary_password7() {
+        List<String> result = LoginValidator.validate("123456", "1234567");
+        assertEquals(List.of("密码不合法"), result);
+    }
+
+    @Test
+    @DisplayName("边界: 密码9位(8+1)")
+    void testBoundary_password9() {
+        List<String> result = LoginValidator.validate("123456", "123456789");
+        assertEquals(List.of("密码不合法"), result);
+    }
+
+    @Test
+    @DisplayName("C3: 账号含空格")
+    void testAccountWithSpace() {
+        List<String> result = LoginValidator.validate("123 56", "12345678");
+        assertEquals(List.of("账号不合法"), result);
+    }
+
+    @Test
+    @DisplayName("C3: 账号含负号")
+    void testAccountWithMinus() {
+        List<String> result = LoginValidator.validate("-12345", "12345678");
+        assertEquals(List.of("账号不合法"), result);
+    }
+
+    @Test
+    @DisplayName("C3: 账号含小数点")
+    void testAccountWithDot() {
+        List<String> result = LoginValidator.validate("123.56", "12345678");
+        assertEquals(List.of("账号不合法"), result);
+    }
+}

hw2/diagrams/cause-effect.puml

@@ -0,0 +1,46 @@
+@startuml cause-effect
+title 因果图 — 登录功能输入验证
+
+' ========== 布局 ==========
+left to right direction
+skinparam defaultTextAlignment center
+skinparam rectangle {
+    RoundCorner 15
+}
+
+' ========== 原因 (Causes) ==========
+rectangle "原因" as causes {
+    rectangle "C1\n账号长度 ≥ 6" as C1 #LightBlue
+    rectangle "C2\n账号长度 ≤ 10" as C2 #LightBlue
+    rectangle "C3\n账号为纯数字\n（自然数）" as C3 #LightBlue
+    rectangle "C4\n密码长度 = 8" as C4 #LightBlue
+}
+
+' ========== 中间节点 ==========
+rectangle "M1\n账号合法\n(C1 ∧ C2 ∧ C3)" as M1 #Wheat
+
+' ========== 结果 (Effects) ==========
+rectangle "结果" as effects {
+    rectangle "E1\n显示\"输入合法\"" as E1 #LightGreen
+    rectangle "E2\n显示\"账号不合法\"" as E2 #Salmon
+    rectangle "E3\n显示\"密码不合法\"" as E3 #Salmon
+}
+
+' ========== 关系 ==========
+C1 --> M1 : AND
+C2 --> M1 : AND
+C3 --> M1 : AND
+
+M1 --> E1 : AND
+C4 --> E1 : AND
+
+M1 ..> E2 : NOT\n(~M1 → E2)
+C4 ..> E3 : NOT\n(~C4 → E3)
+
+' ========== 约束 ==========
+note bottom of causes
+  约束: C1, C2, C3 相互独立
+  C4 独立于 C1/C2/C3
+end note
+
+@enduml

hw2/diagrams/decision-table.puml

@@ -0,0 +1,36 @@
+@startsalt
+title 判定表 — 登录功能输入验证
+{+
+<style>
+header {
+  FontStyle bold
+}
+</style>
+{#
+**条件/动作** | **R1** | **R2** | **R3** | **R4** | **R5** | **R6** | **R7** | **R8**
+. | . | . | . | . | . | . | . | .
+**C1: 账号长度>=6** | T | T | T | T | F | F | F | F
+**C2: 账号长度<=10** | T | T | F | F | - | - | - | -
+**C3: 账号为纯数字** | T | T | - | - | - | - | - | -
+**C4: 密码长度=8** | T | F | T | F | T | F | T | F
+. | . | . | . | . | . | . | . | .
+**E1: 输入合法** | V |   |   |   |   |   |   |  
+**E2: 账号不合法** |   |   | V | V | V | V | V | V
+**E3: 密码不合法** |   | V |   | V |   | V |   | V
+}
+--
+{
+T = 条件为真, F = 条件为假, "-" = 不影响结果
+V = 触发该动作
+..
+**简化后 4 条规则:**
+{#
+**规则** | **账号合法** | **密码合法** | **结果**
+R1 | T | T | 输入合法
+R2 | T | F | 密码不合法
+R3 | F | T | 账号不合法
+R4 | F | F | 账号不合法 + 密码不合法
+}
+}
+}
+@endsalt

hw2/gradle.properties

@@ -0,0 +1 @@
+org.gradle.configuration-cache=true

hw2/gradle/libs.versions.toml

@@ -0,0 +1,7 @@
+[versions]
+guava = "33.4.6-jre"
+junit-jupiter = "5.12.1"
+
+[libraries]
+guava = { module = "com.google.guava:guava", version.ref = "guava" }
+junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit-jupiter" }

hw2/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

hw2/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

hw2/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

hw2/settings.gradle

@@ -0,0 +1,6 @@
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '1.0.0'
+}
+
+rootProject.name = 'login'
+include('app')

hw3/app/build.gradle

@@ -0,0 +1,29 @@
+plugins {
+    id 'application'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation libs.junit.jupiter
+
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+    implementation libs.guava
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+application {
+    mainClass = 'triangle.App'
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
+}

hw3/app/src/main/java/triangle/App.java

@@ -0,0 +1,50 @@
+package triangle;
+
+public class App {
+
+    public enum TriangleType {
+        EQUILATERAL,  // 等边三角形
+        ISOSCELES,    // 等腰三角形
+        SCALENE,      // 一般三角形
+        NOT_A_TRIANGLE // 非三角形
+    }
+
+    public static TriangleType classify(int a, int b, int c) {
+        // 检查边长是否为正整数
+        if (a <= 0 || b <= 0 || c <= 0) {
+            return TriangleType.NOT_A_TRIANGLE;
+        }
+
+        // 检查三角不等式（任意两边之和大于第三边）
+        // 使用 long 防止整数溢出
+        if ((long) a + b <= c || (long) a + c <= b || (long) b + c <= a) {
+            return TriangleType.NOT_A_TRIANGLE;
+        }
+
+        // 判断三角形类型
+        if (a == b && b == c) {
+            return TriangleType.EQUILATERAL;
+        } else if (a == b || b == c || a == c) {
+            return TriangleType.ISOSCELES;
+        } else {
+            return TriangleType.SCALENE;
+        }
+    }
+
+    public static void main(String[] args) {
+        if (args.length != 3) {
+            System.out.println("用法: java triangle.App <边1> <边2> <边3>");
+            return;
+        }
+        int a = Integer.parseInt(args[0]);
+        int b = Integer.parseInt(args[1]);
+        int c = Integer.parseInt(args[2]);
+        TriangleType result = classify(a, b, c);
+        switch (result) {
+            case EQUILATERAL -> System.out.println("等边三角形");
+            case ISOSCELES -> System.out.println("等腰三角形");
+            case SCALENE -> System.out.println("一般三角形");
+            case NOT_A_TRIANGLE -> System.out.println("非三角形");
+        }
+    }
+}

hw3/app/src/test/java/triangle/AppTest.java

@@ -0,0 +1,249 @@
+package triangle;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import static org.junit.jupiter.api.Assertions.*;
+import triangle.App.TriangleType;
+
+class AppTest {
+
+    // ========================================================================
+    // 控制流图分析
+    // ========================================================================
+    //
+    // classify(int a, int b, int c) 的判定节点:
+    //
+    //   D1: a <= 0 || b <= 0 || c <= 0
+    //       条件: c1(a<=0), c2(b<=0), c3(c<=0)
+    //
+    //   D2: (long)a+b <= c || (long)a+c <= b || (long)b+c <= a
+    //       条件: c4(a+b<=c), c5(a+c<=b), c6(b+c<=a)
+    //
+    //   D3: a == b && b == c
+    //       条件: c7(a==b), c8(b==c)
+    //
+    //   D4: a == b || b == c || a == c
+    //       条件: c9(a==b), c10(b==c), c11(a==c)
+    //
+    // 环形复杂度 V(G) = 5（5个判定出口路径）
+    //
+    // ========================================================================
+
+    // ====================================================================
+    // (2) 语句覆盖 — 每条语句至少执行一次
+    // ====================================================================
+    //
+    // 需覆盖所有 5 个 return 语句，最少 5 个测试用例:
+    //
+    // | TC  | 输入 (a,b,c) | 覆盖语句          | 预期结果        |
+    // |-----|-------------|-------------------|----------------|
+    // | SC1 | (-1, 5, 5)  | D1=T→return       | NOT_A_TRIANGLE |
+    // | SC2 | (1, 2, 10)  | D1=F,D2=T→return  | NOT_A_TRIANGLE |
+    // | SC3 | (5, 5, 5)   | D1=F,D2=F,D3=T→return | EQUILATERAL |
+    // | SC4 | (5, 5, 3)   | D1=F,D2=F,D3=F,D4=T→return | ISOSCELES |
+    // | SC5 | (3, 4, 5)   | D1=F,D2=F,D3=F,D4=F→return | SCALENE |
+
+    @Nested
+    @DisplayName("(2) 语句覆盖")
+    class StatementCoverage {
+
+        @Test
+        @DisplayName("SC1: 边<=0 → NOT_A_TRIANGLE (覆盖D1真分支return)")
+        void sc1_negativeSide() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(-1, 5, 5));
+        }
+
+        @Test
+        @DisplayName("SC2: 不满足三角不等式 → NOT_A_TRIANGLE (覆盖D2真分支return)")
+        void sc2_inequalityViolation() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(1, 2, 10));
+        }
+
+        @Test
+        @DisplayName("SC3: 等边三角形 → EQUILATERAL (覆盖D3真分支return)")
+        void sc3_equilateral() {
+            assertEquals(TriangleType.EQUILATERAL, App.classify(5, 5, 5));
+        }
+
+        @Test
+        @DisplayName("SC4: 等腰三角形 → ISOSCELES (覆盖D4真分支return)")
+        void sc4_isosceles() {
+            assertEquals(TriangleType.ISOSCELES, App.classify(5, 5, 3));
+        }
+
+        @Test
+        @DisplayName("SC5: 一般三角形 → SCALENE (覆盖D4假分支return)")
+        void sc5_scalene() {
+            assertEquals(TriangleType.SCALENE, App.classify(3, 4, 5));
+        }
+    }
+
+    // ====================================================================
+    // (3) 判定-条件覆盖
+    // ====================================================================
+    //
+    // 要求: 每个判定取 T/F，每个条件取 T/F，至少各一次。
+    //
+    // 条件清单:
+    //   D1: c1(a<=0)  c2(b<=0)  c3(c<=0)
+    //   D2: c4(a+b<=c) c5(a+c<=b) c6(b+c<=a)
+    //   D3: c7(a==b)  c8(b==c)
+    //   D4: c9(a==b)  c10(b==c) c11(a==c)
+    //
+    // | TC   | 输入        | D1  | c1 c2 c3 | D2  | c4 c5 c6 | D3  | c7 c8 | D4  | c9 c10 c11 | 结果           |
+    // |------|------------|-----|----------|-----|----------|-----|-------|-----|------------|----------------|
+    // | DC1  | (-1, 5, 5) | T   | T  F  F  | -   | -        | -   | -     | -   | -          | NOT_A_TRIANGLE |
+    // | DC2  | (5, -1, 5) | T   | F  T  F  | -   | -        | -   | -     | -   | -          | NOT_A_TRIANGLE |
+    // | DC3  | (5, 5, -1) | T   | F  F  T  | -   | -        | -   | -     | -   | -          | NOT_A_TRIANGLE |
+    // | DC4  | (1, 2, 10) | F   | F  F  F  | T   | T  F  F  | -   | -     | -   | -          | NOT_A_TRIANGLE |
+    // | DC5  | (1, 10, 2) | F   | F  F  F  | T   | F  T  F  | -   | -     | -   | -          | NOT_A_TRIANGLE |
+    // | DC6  | (10, 1, 2) | F   | F  F  F  | T   | F  F  T  | -   | -     | -   | -          | NOT_A_TRIANGLE |
+    // | DC7  | (5, 5, 5)  | F   | F  F  F  | F   | F  F  F  | T   | T  T  | -   | -          | EQUILATERAL    |
+    // | DC8  | (5, 5, 3)  | F   | F  F  F  | F   | F  F  F  | F   | T  F  | T   | T  F  F    | ISOSCELES      |
+    // | DC9  | (3, 5, 5)  | F   | F  F  F  | F   | F  F  F  | F   | F  T  | T   | F  T  F    | ISOSCELES      |
+    // | DC10 | (5, 3, 5)  | F   | F  F  F  | F   | F  F  F  | F   | F  F  | T   | F  F  T    | ISOSCELES      |
+    // | DC11 | (3, 4, 5)  | F   | F  F  F  | F   | F  F  F  | F   | F  F  | F   | F  F  F    | SCALENE        |
+    //
+    // 覆盖验证:
+    //   c1:  T(DC1) F(DC2~11) ✓   c2:  T(DC2) F(DC1,DC3~11) ✓   c3:  T(DC3) F(DC1,DC2,DC4~11) ✓
+    //   c4:  T(DC4) F(DC5~11) ✓   c5:  T(DC5) F(DC4,DC6~11) ✓   c6:  T(DC6) F(DC4,DC5,DC7~11) ✓
+    //   c7:  T(DC7,DC8) F(DC9~11) ✓   c8:  T(DC7,DC9) F(DC8,DC10,DC11) ✓
+    //   c9:  T(DC8) F(DC9~11) ✓   c10: T(DC9) F(DC8,DC10,DC11) ✓   c11: T(DC10) F(DC8,DC9,DC11) ✓
+    //   D1: T(DC1~3) F(DC4~11)  D2: T(DC4~6) F(DC7~11)  D3: T(DC7) F(DC8~11)  D4: T(DC8~10) F(DC11) ✓
+
+    @Nested
+    @DisplayName("(3) 判定-条件覆盖")
+    class DecisionConditionCoverage {
+
+        @Test
+        @DisplayName("DC1: a<=0=T → D1=T → NOT_A_TRIANGLE")
+        void dc1_aNegative() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(-1, 5, 5));
+        }
+
+        @Test
+        @DisplayName("DC2: b<=0=T → D1=T → NOT_A_TRIANGLE")
+        void dc2_bNegative() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(5, -1, 5));
+        }
+
+        @Test
+        @DisplayName("DC3: c<=0=T → D1=T → NOT_A_TRIANGLE")
+        void dc3_cNegative() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(5, 5, -1));
+        }
+
+        @Test
+        @DisplayName("DC4: a+b<=c=T → D2=T → NOT_A_TRIANGLE")
+        void dc4_sumABLeC() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(1, 2, 10));
+        }
+
+        @Test
+        @DisplayName("DC5: a+c<=b=T → D2=T → NOT_A_TRIANGLE")
+        void dc5_sumACLeB() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(1, 10, 2));
+        }
+
+        @Test
+        @DisplayName("DC6: b+c<=a=T → D2=T → NOT_A_TRIANGLE")
+        void dc6_sumBCLeA() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(10, 1, 2));
+        }
+
+        @Test
+        @DisplayName("DC7: a==b=T, b==c=T → D3=T → EQUILATERAL")
+        void dc7_equilateral() {
+            assertEquals(TriangleType.EQUILATERAL, App.classify(5, 5, 5));
+        }
+
+        @Test
+        @DisplayName("DC8: a==b=T, b==c=F → D3=F; a==b=T → D4=T → ISOSCELES")
+        void dc8_isoscelesAB() {
+            assertEquals(TriangleType.ISOSCELES, App.classify(5, 5, 3));
+        }
+
+        @Test
+        @DisplayName("DC9: a==b=F, b==c=T → D3=F; b==c=T → D4=T → ISOSCELES")
+        void dc9_isoscelesBC() {
+            assertEquals(TriangleType.ISOSCELES, App.classify(3, 5, 5));
+        }
+
+        @Test
+        @DisplayName("DC10: a==b=F, b==c=F → D3=F; a==c=T → D4=T → ISOSCELES")
+        void dc10_isoscelesAC() {
+            assertEquals(TriangleType.ISOSCELES, App.classify(5, 3, 5));
+        }
+
+        @Test
+        @DisplayName("DC11: 所有条件F → D3=F, D4=F → SCALENE")
+        void dc11_scalene() {
+            assertEquals(TriangleType.SCALENE, App.classify(3, 4, 5));
+        }
+    }
+
+    // ====================================================================
+    // (4) 基本路径覆盖
+    // ====================================================================
+    //
+    // 控制流图 (简化判定节点):
+    //   N1(Start) → N2(D1) →T→ N3(return NOT_A_TRIANGLE) → N11(End)
+    //                       →F→ N4(D2) →T→ N5(return NOT_A_TRIANGLE) → N11
+    //                                  →F→ N6(D3) →T→ N7(return EQUILATERAL) → N11
+    //                                             →F→ N8(D4) →T→ N9(return ISOSCELES) → N11
+    //                                                        →F→ N10(return SCALENE)   → N11
+    //
+    // 节点数 N=11, 边数 E=14
+    // 环形复杂度 V(G) = E - N + 2 = 14 - 11 + 2 = 5
+    //
+    // 5 条独立基本路径:
+    //   Path1: N1→N2(T)→N3→N11             (边<=0, 非三角形)
+    //   Path2: N1→N2(F)→N4(T)→N5→N11       (三角不等式不满足, 非三角形)
+    //   Path3: N1→N2(F)→N4(F)→N6(T)→N7→N11 (等边三角形)
+    //   Path4: N1→N2(F)→N4(F)→N6(F)→N8(T)→N9→N11 (等腰三角形)
+    //   Path5: N1→N2(F)→N4(F)→N6(F)→N8(F)→N10→N11 (一般三角形)
+    //
+    // | TC   | 路径   | 输入 (a,b,c) | 预期结果        |
+    // |------|--------|-------------|----------------|
+    // | BP1  | Path1  | (0, 5, 5)   | NOT_A_TRIANGLE |
+    // | BP2  | Path2  | (1, 2, 4)   | NOT_A_TRIANGLE |
+    // | BP3  | Path3  | (6, 6, 6)   | EQUILATERAL    |
+    // | BP4  | Path4  | (3, 3, 5)   | ISOSCELES      |
+    // | BP5  | Path5  | (3, 4, 6)   | SCALENE        |
+
+    @Nested
+    @DisplayName("(4) 基本路径覆盖 (V(G)=5)")
+    class BasicPathCoverage {
+
+        @Test
+        @DisplayName("BP1/Path1: N1→N2(T)→N3→End — 边<=0")
+        void bp1_path1_nonPositive() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(0, 5, 5));
+        }
+
+        @Test
+        @DisplayName("BP2/Path2: N1→N2(F)→N4(T)→N5→End — 三角不等式不满足")
+        void bp2_path2_inequalityFail() {
+            assertEquals(TriangleType.NOT_A_TRIANGLE, App.classify(1, 2, 4));
+        }
+
+        @Test
+        @DisplayName("BP3/Path3: N1→N2(F)→N4(F)→N6(T)→N7→End — 等边")
+        void bp3_path3_equilateral() {
+            assertEquals(TriangleType.EQUILATERAL, App.classify(6, 6, 6));
+        }
+
+        @Test
+        @DisplayName("BP4/Path4: N1→N2(F)→N4(F)→N6(F)→N8(T)→N9→End — 等腰")
+        void bp4_path4_isosceles() {
+            assertEquals(TriangleType.ISOSCELES, App.classify(3, 3, 5));
+        }
+
+        @Test
+        @DisplayName("BP5/Path5: N1→N2(F)→N4(F)→N6(F)→N8(F)→N10→End — 一般")
+        void bp5_path5_scalene() {
+            assertEquals(TriangleType.SCALENE, App.classify(3, 4, 6));
+        }
+    }
+}

hw3/diagrams/flowchart.puml

@@ -0,0 +1,34 @@
+@startuml flowchart
+title 三角形分类程序流程图 — classify(a, b, c)
+
+start
+
+:输入三条边 a, b, c;
+
+if (a <= 0 || b <= 0 || c <= 0 ?) then (是)
+  :返回 NOT_A_TRIANGLE;
+  stop
+else (否)
+endif
+
+if ((long)a+b <= c ||\n(long)a+c <= b ||\n(long)b+c <= a ?) then (是)
+  :返回 NOT_A_TRIANGLE;
+  stop
+else (否)
+endif
+
+if (a == b && b == c ?) then (是)
+  :返回 EQUILATERAL\n(等边三角形);
+  stop
+else (否)
+endif
+
+if (a == b || b == c || a == c ?) then (是)
+  :返回 ISOSCELES\n(等腰三角形);
+  stop
+else (否)
+  :返回 SCALENE\n(一般三角形);
+  stop
+endif
+
+@enduml

hw3/gradle.properties

@@ -0,0 +1,2 @@
+org.gradle.configuration-cache=true
+

hw3/gradle/libs.versions.toml

@@ -0,0 +1,7 @@
+[versions]
+guava = "33.4.6-jre"
+junit-jupiter = "5.12.1"
+
+[libraries]
+guava = { module = "com.google.guava:guava", version.ref = "guava" }
+junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit-jupiter" }

hw3/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

hw3/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

hw3/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

hw3/settings.gradle

@@ -0,0 +1,6 @@
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '1.0.0'
+}
+
+rootProject.name = 'triangle'
+include('app')

hw4/task1-register-form/app/build.gradle

@@ -0,0 +1,49 @@
+apply plugin: 'com.android.application'
+
+configurations.configureEach {
+    exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk7'
+    exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk8'
+}
+
+android {
+    namespace 'com.example.task1registerform'
+    compileSdk 34
+
+    defaultConfig {
+        applicationId 'com.example.task1registerform'
+        minSdk 26
+        targetSdk 34
+        versionCode 1
+        versionName '1.0'
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+
+    testOptions {
+        animationsDisabled true
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'androidx.core:core:1.13.1'
+
+    androidTestImplementation 'androidx.test:core:1.5.0'
+    androidTestImplementation 'androidx.test:runner:1.5.2'
+    androidTestImplementation 'androidx.test:rules:1.5.0'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.5.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-contrib:3.5.1'
+    androidTestImplementation 'junit:junit:4.13.2'
+}

hw4/task1-register-form/app/src/androidTest/java/com/example/task1registerform/MainActivityFormTest.java

@@ -0,0 +1,127 @@
+package com.example.task1registerform;
+
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.action.ViewActions.click;
+import static androidx.test.espresso.action.ViewActions.closeSoftKeyboard;
+import static androidx.test.espresso.action.ViewActions.replaceText;
+import static androidx.test.espresso.assertion.ViewAssertions.matches;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.matcher.ViewMatchers.withId;
+import static androidx.test.espresso.matcher.ViewMatchers.withText;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.fail;
+
+import android.app.UiAutomation;
+import android.view.accessibility.AccessibilityEvent;
+
+import androidx.test.core.app.ActivityScenario;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.concurrent.TimeoutException;
+
+@RunWith(AndroidJUnit4.class)
+public class MainActivityFormTest {
+
+    private ActivityScenario<MainActivity> activityScenario;
+
+    @Before
+    public void setUp() {
+        activityScenario = ActivityScenario.launch(MainActivity.class);
+    }
+
+    @After
+    public void tearDown() {
+        activityScenario.close();
+    }
+
+    /**
+     * 任意输入框为空时，应提示完善信息并保持输入框内容不变。
+     */
+    @Test
+    public void testEmptyFields_ShowIncompleteToast_AndKeepEmptyInputs() {
+        onView(withId(R.id.et_name)).perform(replaceText(""), closeSoftKeyboard());
+        onView(withId(R.id.et_phone)).perform(replaceText(""), closeSoftKeyboard());
+        onView(withId(R.id.et_email)).perform(replaceText(""), closeSoftKeyboard());
+
+        clickAndAssertToast(R.id.btn_register, "请完善所有注册信息");
+        onView(withId(R.id.et_name)).check(matches(withText("")));
+        onView(withId(R.id.et_phone)).check(matches(withText("")));
+        onView(withId(R.id.et_email)).check(matches(withText("")));
+    }
+
+    /**
+     * 手机号不满足 11 位数字规则时，应提示手机号错误并保留当前输入。
+     */
+    @Test
+    public void testInvalidPhone_ShowPhoneToast_AndKeepInputs() {
+        fillForm("张三", "123456", "zhangsan@example.com");
+
+        clickAndAssertToast(R.id.btn_register, "请输入正确的11位手机号");
+        onView(withId(R.id.et_name)).check(matches(withText("张三")));
+        onView(withId(R.id.et_phone)).check(matches(withText("123456")));
+        onView(withId(R.id.et_email)).check(matches(withText("zhangsan@example.com")));
+    }
+
+    /**
+     * 邮箱格式错误时，应提示邮箱错误并保留用户已经输入的数据。
+     */
+    @Test
+    public void testInvalidEmail_ShowEmailToast_AndKeepInputs() {
+        fillForm("李四", "13812345678", "invalid-email");
+
+        clickAndAssertToast(R.id.btn_register, "请输入正确的邮箱地址");
+        onView(withId(R.id.et_name)).check(matches(withText("李四")));
+        onView(withId(R.id.et_phone)).check(matches(withText("13812345678")));
+        onView(withId(R.id.et_email)).check(matches(withText("invalid-email")));
+    }
+
+    /**
+     * 所有输入均合法时，应提示注册成功并清空全部输入框。
+     */
+    @Test
+    public void testRegisterSuccess_ShowSuccessToast_AndClearInputs() {
+        fillForm("王五", "13912345678", "wangwu@example.com");
+
+        clickAndAssertToast(R.id.btn_register, "注册成功");
+        onView(withId(R.id.et_name)).check(matches(withText("")));
+        onView(withId(R.id.et_phone)).check(matches(withText("")));
+        onView(withId(R.id.et_email)).check(matches(withText("")));
+    }
+
+    private void fillForm(String name, String phone, String email) {
+        onView(withId(R.id.et_name)).perform(replaceText(name), closeSoftKeyboard());
+        onView(withId(R.id.et_phone)).perform(replaceText(phone), closeSoftKeyboard());
+        onView(withId(R.id.et_email)).perform(replaceText(email), closeSoftKeyboard());
+    }
+
+    private void clickAndAssertToast(int viewId, String message) {
+        UiAutomation uiAutomation = InstrumentationRegistry.getInstrumentation().getUiAutomation();
+
+        try {
+            AccessibilityEvent event = uiAutomation.executeAndWaitForEvent(
+                    () -> onView(withId(viewId)).perform(click()),
+                    candidate -> candidate.getEventType() == AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED
+                            && containsText(candidate, message),
+                    5000
+            );
+            assertNotNull(event);
+        } catch (TimeoutException exception) {
+            fail("Toast not shown: " + message);
+        }
+    }
+
+    private boolean containsText(AccessibilityEvent event, String message) {
+        for (CharSequence text : event.getText()) {
+            if (message.contentEquals(text)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

hw4/task1-register-form/app/src/main/AndroidManifest.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:label="@string/app_name"
+        android:theme="@style/Theme.Task1RegisterForm">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

hw4/task1-register-form/app/src/main/java/com/example/task1registerform/MainActivity.java

@@ -0,0 +1,70 @@
+package com.example.task1registerform;
+
+import android.os.Bundle;
+import android.util.Patterns;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.Toast;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class MainActivity extends AppCompatActivity {
+
+    private EditText etName;
+    private EditText etPhone;
+    private EditText etEmail;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        etName = findViewById(R.id.et_name);
+        etPhone = findViewById(R.id.et_phone);
+        etEmail = findViewById(R.id.et_email);
+        Button btnRegister = findViewById(R.id.btn_register);
+
+        btnRegister.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                handleRegister();
+            }
+        });
+    }
+
+    private void handleRegister() {
+        String name = etName.getText().toString().trim();
+        String phone = etPhone.getText().toString().trim();
+        String email = etEmail.getText().toString().trim();
+
+        // 按实验要求顺序完成表单校验，确保 Toast 与场景一一对应。
+        if (name.isEmpty() || phone.isEmpty() || email.isEmpty()) {
+            showToast(R.string.toast_complete_info);
+            return;
+        }
+
+        if (!phone.matches("^\\d{11}$")) {
+            showToast(R.string.toast_invalid_phone);
+            return;
+        }
+
+        if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
+            showToast(R.string.toast_invalid_email);
+            return;
+        }
+
+        showToast(R.string.toast_register_success);
+        clearInputs();
+    }
+
+    private void clearInputs() {
+        etName.setText("");
+        etPhone.setText("");
+        etEmail.setText("");
+    }
+
+    private void showToast(int messageResId) {
+        Toast.makeText(this, getString(messageResId), Toast.LENGTH_SHORT).show();
+    }
+}

hw4/task1-register-form/app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="20dp">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="20dp"
+        android:text="@string/title_register_form"
+        android:textSize="22sp"
+        android:textStyle="bold" />
+
+    <EditText
+        android:id="@+id/et_name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:hint="@string/hint_name"
+        android:inputType="textPersonName" />
+
+    <EditText
+        android:id="@+id/et_phone"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:hint="@string/hint_phone"
+        android:inputType="phone" />
+
+    <EditText
+        android:id="@+id/et_email"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="20dp"
+        android:hint="@string/hint_email"
+        android:inputType="textEmailAddress" />
+
+    <Button
+        android:id="@+id/btn_register"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/action_register" />
+
+</LinearLayout>

hw4/task1-register-form/app/src/main/res/values/strings.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Task 1 Register Form</string>
+    <string name="title_register_form">用户注册表单</string>
+    <string name="hint_name">请输入姓名</string>
+    <string name="hint_phone">请输入 11 位手机号</string>
+    <string name="hint_email">请输入邮箱地址</string>
+    <string name="action_register">提交注册</string>
+    <string name="toast_complete_info">请完善所有注册信息</string>
+    <string name="toast_invalid_phone">请输入正确的11位手机号</string>
+    <string name="toast_invalid_email">请输入正确的邮箱地址</string>
+    <string name="toast_register_success">注册成功</string>
+</resources>

hw4/task1-register-form/app/src/main/res/values/themes.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Task1RegisterForm" parent="Theme.AppCompat.Light.NoActionBar" />
+</resources>

hw4/task1-register-form/build.gradle

@@ -0,0 +1,9 @@
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:8.5.0'
+    }
+}

hw4/task1-register-form/gradle.properties

@@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+android.nonTransitiveRClass=true
+org.gradle.java.home=C\:\\Program Files\\Android\\Android Studio\\jbr

hw4/task1-register-form/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

hw4/task1-register-form/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

hw4/task1-register-form/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

hw4/task1-register-form/settings.gradle

@@ -0,0 +1,19 @@
+pluginManagement {
+	repositories {
+		google()
+		mavenCentral()
+		gradlePluginPortal()
+	}
+}
+
+dependencyResolutionManagement {
+	repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+	repositories {
+		google()
+		mavenCentral()
+	}
+}
+
+rootProject.name = 'task1-register-form'
+include ':app'
+

hw4/task2-complex-controls/app/build.gradle

@@ -0,0 +1,49 @@
+apply plugin: 'com.android.application'
+
+configurations.configureEach {
+    exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk7'
+    exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk8'
+}
+
+android {
+    namespace 'com.example.task2complexcontrols'
+    compileSdk 34
+
+    defaultConfig {
+        applicationId 'com.example.task2complexcontrols'
+        minSdk 26
+        targetSdk 34
+        versionCode 1
+        versionName '1.0'
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+
+    testOptions {
+        animationsDisabled true
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'androidx.core:core:1.13.1'
+
+    androidTestImplementation 'androidx.test:core:1.5.0'
+    androidTestImplementation 'androidx.test:runner:1.5.2'
+    androidTestImplementation 'androidx.test:rules:1.5.0'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.5.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-contrib:3.5.1'
+    androidTestImplementation 'junit:junit:4.13.2'
+}

hw4/task2-complex-controls/app/src/androidTest/java/com/example/task2complexcontrols/MainActivityComplexUiTest.java

@@ -0,0 +1,134 @@
+package com.example.task2complexcontrols;
+
+import static androidx.test.espresso.Espresso.onData;
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.action.ViewActions.click;
+import static androidx.test.espresso.action.ViewActions.closeSoftKeyboard;
+import static androidx.test.espresso.action.ViewActions.replaceText;
+import static androidx.test.espresso.action.ViewActions.scrollTo;
+import static androidx.test.espresso.assertion.ViewAssertions.matches;
+import static androidx.test.espresso.matcher.ViewMatchers.isChecked;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.matcher.ViewMatchers.isEnabled;
+import static androidx.test.espresso.matcher.ViewMatchers.withId;
+import static androidx.test.espresso.matcher.ViewMatchers.withSpinnerText;
+import static androidx.test.espresso.matcher.ViewMatchers.withText;
+import static org.hamcrest.Matchers.allOf;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.instanceOf;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.not;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.fail;
+
+import android.app.UiAutomation;
+import android.view.accessibility.AccessibilityEvent;
+
+import androidx.test.core.app.ActivityScenario;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.concurrent.TimeoutException;
+
+@RunWith(AndroidJUnit4.class)
+public class MainActivityComplexUiTest {
+
+    private ActivityScenario<MainActivity> activityScenario;
+
+    @Before
+    public void setUp() {
+        activityScenario = ActivityScenario.launch(MainActivity.class);
+    }
+
+    @After
+    public void tearDown() {
+        activityScenario.close();
+    }
+
+    /**
+     * 协议复选框应直接控制提交按钮是否可点击。
+     */
+    @Test
+    public void testAgreementToggle_ChangesButtonState() {
+        onView(withId(R.id.btn_submit)).check(matches(not(isEnabled())));
+
+        onView(withId(R.id.cb_agreement)).perform(scrollTo(), click());
+
+        onView(withId(R.id.cb_agreement)).check(matches(isChecked()));
+        onView(withId(R.id.btn_submit)).check(matches(isEnabled()));
+    }
+
+    /**
+     * 单选按钮、复选框和 Spinner 都应支持正确选择并反映当前状态。
+     */
+    @Test
+    public void testSelectionControls_UpdateUiStateCorrectly() {
+        onView(withId(R.id.et_name)).perform(replaceText("赵六"), closeSoftKeyboard());
+        onView(withId(R.id.rb_female)).perform(click());
+        onView(withId(R.id.cb_sport)).perform(scrollTo(), click());
+        onView(withId(R.id.cb_read)).perform(scrollTo(), click());
+        selectCity("上海");
+
+        onView(withId(R.id.et_name)).check(matches(withText("赵六")));
+        onView(withId(R.id.rb_female)).check(matches(isChecked()));
+        onView(withId(R.id.cb_sport)).check(matches(isChecked()));
+        onView(withId(R.id.cb_read)).check(matches(isChecked()));
+        onView(withId(R.id.spinner_city)).check(matches(withSpinnerText(containsString("上海"))));
+    }
+
+    /**
+     * 完整提交流程应输出与 Spinner 当前选择一致的 Toast 提示。
+     */
+    @Test
+    public void testSubmitFlow_ShowsToastWithSelectedCity() {
+        onView(withId(R.id.et_name)).perform(replaceText("孙七"), closeSoftKeyboard());
+        onView(withId(R.id.rb_male)).perform(click());
+        onView(withId(R.id.cb_sport)).perform(scrollTo(), click());
+        onView(withId(R.id.cb_music)).perform(scrollTo(), click());
+        selectCity("深圳");
+        onView(withId(R.id.cb_agreement)).perform(scrollTo(), click());
+
+        onView(withId(R.id.rb_male)).check(matches(isChecked()));
+        onView(withId(R.id.cb_sport)).check(matches(isChecked()));
+        onView(withId(R.id.cb_music)).check(matches(isChecked()));
+        onView(withId(R.id.spinner_city)).check(matches(withSpinnerText(containsString("深圳"))));
+        onView(withId(R.id.btn_submit)).check(matches(isEnabled()));
+
+        clickAndAssertToast("提交成功！您选择的城市是：深圳");
+    }
+
+    private void selectCity(String city) {
+        onView(withId(R.id.spinner_city)).perform(scrollTo(), click());
+        onData(allOf(is(instanceOf(String.class)), is(city))).perform(click());
+    }
+
+    private void clickAndAssertToast(String message) {
+        UiAutomation uiAutomation = InstrumentationRegistry.getInstrumentation().getUiAutomation();
+
+        try {
+            AccessibilityEvent event = uiAutomation.executeAndWaitForEvent(
+                    () -> onView(withId(R.id.btn_submit)).perform(scrollTo(), click()),
+                    candidate -> candidate.getEventType() == AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED
+                            && containsText(candidate, message),
+                    5000
+            );
+            assertNotNull(event);
+        } catch (TimeoutException exception) {
+            fail("Toast not shown: " + message);
+        }
+    }
+
+    private boolean containsText(AccessibilityEvent event, String message) {
+        for (CharSequence text : event.getText()) {
+            if (message.contentEquals(text)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

hw4/task2-complex-controls/app/src/main/AndroidManifest.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:label="@string/app_name"
+        android:theme="@style/Theme.Task2ComplexControls">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

hw4/task2-complex-controls/app/src/main/java/com/example/task2complexcontrols/MainActivity.java

@@ -0,0 +1,58 @@
+package com.example.task2complexcontrols;
+
+import android.os.Bundle;
+import android.widget.ArrayAdapter;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.EditText;
+import android.widget.Spinner;
+import android.widget.Toast;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class MainActivity extends AppCompatActivity {
+
+    private EditText etName;
+    private Spinner spinnerCity;
+    private CheckBox cbAgreement;
+    private Button btnSubmit;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        etName = findViewById(R.id.et_name);
+        spinnerCity = findViewById(R.id.spinner_city);
+        cbAgreement = findViewById(R.id.cb_agreement);
+        btnSubmit = findViewById(R.id.btn_submit);
+
+        setupCitySpinner();
+        setupAgreementRule();
+        setupSubmitAction();
+    }
+
+    private void setupCitySpinner() {
+        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
+                this,
+                R.array.city_options,
+                android.R.layout.simple_spinner_item
+        );
+        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        spinnerCity.setAdapter(adapter);
+    }
+
+    private void setupAgreementRule() {
+        // 未勾选协议时禁止提交，勾选后恢复可点击。
+        btnSubmit.setEnabled(false);
+        cbAgreement.setOnCheckedChangeListener((buttonView, isChecked) -> btnSubmit.setEnabled(isChecked));
+    }
+
+    private void setupSubmitAction() {
+        btnSubmit.setOnClickListener(view -> {
+            String city = String.valueOf(spinnerCity.getSelectedItem());
+            String message = getString(R.string.toast_submit_message, city);
+            Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();
+        });
+    }
+}

hw4/task2-complex-controls/app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,107 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="20dp">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="20dp"
+            android:text="@string/title_form"
+            android:textSize="22sp"
+            android:textStyle="bold" />
+
+        <EditText
+            android:id="@+id/et_name"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="20dp"
+            android:hint="@string/hint_name"
+            android:inputType="textPersonName" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/label_gender"
+            android:textStyle="bold" />
+
+        <RadioGroup
+            android:id="@+id/rg_gender"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="20dp"
+            android:orientation="horizontal">
+
+            <RadioButton
+                android:id="@+id/rb_male"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/option_male" />
+
+            <RadioButton
+                android:id="@+id/rb_female"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="20dp"
+                android:text="@string/option_female" />
+        </RadioGroup>
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/label_hobbies"
+            android:textStyle="bold" />
+
+        <CheckBox
+            android:id="@+id/cb_sport"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/option_sport" />
+
+        <CheckBox
+            android:id="@+id/cb_read"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/option_read" />
+
+        <CheckBox
+            android:id="@+id/cb_music"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="20dp"
+            android:text="@string/option_music" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/label_city"
+            android:textStyle="bold" />
+
+        <Spinner
+            android:id="@+id/spinner_city"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="20dp" />
+
+        <CheckBox
+            android:id="@+id/cb_agreement"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="20dp"
+            android:text="@string/label_agreement" />
+
+        <Button
+            android:id="@+id/btn_submit"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:enabled="false"
+            android:text="@string/action_submit" />
+
+    </LinearLayout>
+</ScrollView>

hw4/task2-complex-controls/app/src/main/res/values/arrays.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string-array name="city_options">
+        <item>北京</item>
+        <item>上海</item>
+        <item>广州</item>
+        <item>深圳</item>
+    </string-array>
+</resources>

hw4/task2-complex-controls/app/src/main/res/values/strings.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Task 2 Complex Controls</string>
+    <string name="title_form">用户信息提交</string>
+    <string name="hint_name">请输入姓名</string>
+    <string name="label_gender">请选择性别</string>
+    <string name="label_hobbies">请选择兴趣爱好</string>
+    <string name="label_city">请选择城市</string>
+    <string name="label_agreement">我已阅读并同意用户协议</string>
+    <string name="action_submit">提交信息</string>
+    <string name="option_male">男</string>
+    <string name="option_female">女</string>
+    <string name="option_sport">运动</string>
+    <string name="option_read">阅读</string>
+    <string name="option_music">音乐</string>
+    <string name="toast_submit_message">提交成功！您选择的城市是：%1$s</string>
+</resources>

hw4/task2-complex-controls/app/src/main/res/values/themes.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Task2ComplexControls" parent="Theme.AppCompat.Light.NoActionBar" />
+</resources>

hw4/task2-complex-controls/build.gradle

@@ -0,0 +1,9 @@
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:8.5.0'
+    }
+}

hw4/task2-complex-controls/gradle.properties

@@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+android.nonTransitiveRClass=true
+org.gradle.java.home=C\:\\Program Files\\Android\\Android Studio\\jbr

hw4/task2-complex-controls/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

hw4/task2-complex-controls/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

hw4/task2-complex-controls/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

hw4/task2-complex-controls/settings.gradle

@@ -0,0 +1,19 @@
+pluginManagement {
+	repositories {
+		google()
+		mavenCentral()
+		gradlePluginPortal()
+	}
+}
+
+dependencyResolutionManagement {
+	repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+	repositories {
+		google()
+		mavenCentral()
+	}
+}
+
+rootProject.name = 'task2-complex-controls'
+include ':app'
+

hw4/task3-intent-navigation/app/build.gradle

@@ -0,0 +1,49 @@
+apply plugin: 'com.android.application'
+
+configurations.configureEach {
+    exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk7'
+    exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk8'
+}
+
+android {
+    namespace 'com.example.task3intentnavigation'
+    compileSdk 34
+
+    defaultConfig {
+        applicationId 'com.example.task3intentnavigation'
+        minSdk 26
+        targetSdk 34
+        versionCode 1
+        versionName '1.0'
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+
+    testOptions {
+        animationsDisabled true
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'androidx.core:core:1.13.1'
+
+    androidTestImplementation 'androidx.test:core:1.5.0'
+    androidTestImplementation 'androidx.test:runner:1.5.2'
+    androidTestImplementation 'androidx.test:rules:1.5.0'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.5.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-contrib:3.5.1'
+    androidTestImplementation 'junit:junit:4.13.2'
+}

hw4/task3-intent-navigation/app/src/androidTest/java/com/example/task3intentnavigation/MainActivityIntentTest.java

@@ -0,0 +1,104 @@
+package com.example.task3intentnavigation;
+
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.action.ViewActions.click;
+import static androidx.test.espresso.action.ViewActions.closeSoftKeyboard;
+import static androidx.test.espresso.action.ViewActions.replaceText;
+import static androidx.test.espresso.assertion.ViewAssertions.doesNotExist;
+import static androidx.test.espresso.assertion.ViewAssertions.matches;
+import static androidx.test.espresso.intent.Intents.intended;
+import static androidx.test.espresso.intent.matcher.IntentMatchers.hasComponent;
+import static androidx.test.espresso.intent.matcher.IntentMatchers.hasExtra;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.matcher.ViewMatchers.withId;
+import static androidx.test.espresso.matcher.ViewMatchers.withText;
+import static org.hamcrest.Matchers.allOf;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.fail;
+
+import android.app.UiAutomation;
+import android.view.accessibility.AccessibilityEvent;
+
+import androidx.test.espresso.intent.rule.IntentsTestRule;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.concurrent.TimeoutException;
+
+@RunWith(AndroidJUnit4.class)
+public class MainActivityIntentTest {
+
+    @Rule
+    public IntentsTestRule<MainActivity> intentsTestRule = new IntentsTestRule<>(MainActivity.class);
+
+    /**
+     * 完整流程应覆盖页面跳转、Intent 数据验证、详情展示与返回清空输入框。
+     */
+    @Test
+    public void testSubmitFlow_VerifyIntentDataAndClearInputsOnReturn() {
+        String name = "周八";
+        String age = "23";
+
+        onView(withId(R.id.et_name)).perform(replaceText(name), closeSoftKeyboard());
+        onView(withId(R.id.et_age)).perform(replaceText(age), closeSoftKeyboard());
+
+        onView(withId(R.id.btn_submit)).perform(click());
+
+        intended(allOf(
+                hasComponent(DetailActivity.class.getName()),
+                hasExtra(MainActivity.EXTRA_NAME, name),
+                hasExtra(MainActivity.EXTRA_AGE, age)
+        ));
+
+        onView(withId(R.id.tv_name)).check(matches(withText("姓名：" + name)));
+        onView(withId(R.id.tv_age)).check(matches(withText("年龄：" + age)));
+
+        onView(withId(R.id.btn_back)).perform(click());
+
+        onView(withId(R.id.btn_submit)).check(matches(isDisplayed()));
+        onView(withId(R.id.et_name)).check(matches(withText("")));
+        onView(withId(R.id.et_age)).check(matches(withText("")));
+    }
+
+    /**
+     * 年龄为空时应提示用户输入年龄，且不发生页面跳转。
+     */
+    @Test
+    public void testEmptyAge_ShowToastAndStayOnMainPage() {
+        onView(withId(R.id.et_name)).perform(replaceText("周八"), closeSoftKeyboard());
+        onView(withId(R.id.et_age)).perform(replaceText(""), closeSoftKeyboard());
+
+        clickAndAssertToast("请输入年龄");
+        onView(withId(R.id.btn_submit)).check(matches(isDisplayed()));
+        onView(withId(R.id.tv_name)).check(doesNotExist());
+    }
+
+    private void clickAndAssertToast(String message) {
+        UiAutomation uiAutomation = InstrumentationRegistry.getInstrumentation().getUiAutomation();
+
+        try {
+            AccessibilityEvent event = uiAutomation.executeAndWaitForEvent(
+                    () -> onView(withId(R.id.btn_submit)).perform(click()),
+                    candidate -> candidate.getEventType() == AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED
+                            && containsText(candidate, message),
+                    5000
+            );
+            assertNotNull(event);
+        } catch (TimeoutException exception) {
+            fail("Toast not shown: " + message);
+        }
+    }
+
+    private boolean containsText(AccessibilityEvent event, String message) {
+        for (CharSequence text : event.getText()) {
+            if (message.contentEquals(text)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

hw4/task3-intent-navigation/app/src/main/AndroidManifest.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:label="@string/app_name"
+        android:theme="@style/Theme.Task3IntentNavigation">
+        <activity
+            android:name=".DetailActivity"
+            android:exported="false" />
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

hw4/task3-intent-navigation/app/src/main/java/com/example/task3intentnavigation/DetailActivity.java

@@ -0,0 +1,39 @@
+package com.example.task3intentnavigation;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.widget.Button;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class DetailActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_detail);
+
+        TextView tvName = findViewById(R.id.tv_name);
+        TextView tvAge = findViewById(R.id.tv_age);
+        Button btnBack = findViewById(R.id.btn_back);
+
+        String name = getIntent().getStringExtra(MainActivity.EXTRA_NAME);
+        String age = getIntent().getStringExtra(MainActivity.EXTRA_AGE);
+
+        if (name == null) {
+            name = "";
+        }
+        if (age == null) {
+            age = "";
+        }
+
+        tvName.setText(getString(R.string.label_name_value, name));
+        tvAge.setText(getString(R.string.label_age_value, age));
+
+        btnBack.setOnClickListener(view -> {
+            setResult(RESULT_OK, new Intent());
+            finish();
+        });
+    }
+}

hw4/task3-intent-navigation/app/src/main/java/com/example/task3intentnavigation/MainActivity.java

@@ -0,0 +1,71 @@
+package com.example.task3intentnavigation;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.Toast;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class MainActivity extends AppCompatActivity {
+
+    public static final String EXTRA_NAME = "extra_name";
+    public static final String EXTRA_AGE = "extra_age";
+    private static final int REQUEST_DETAIL = 1001;
+
+    private EditText etName;
+    private EditText etAge;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        etName = findViewById(R.id.et_name);
+        etAge = findViewById(R.id.et_age);
+        Button btnSubmit = findViewById(R.id.btn_submit);
+
+        btnSubmit.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                submitInfo();
+            }
+        });
+    }
+
+    private void submitInfo() {
+        String name = etName.getText().toString().trim();
+        String age = etAge.getText().toString().trim();
+
+        if (name.isEmpty()) {
+            Toast.makeText(this, R.string.toast_input_name, Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        if (age.isEmpty()) {
+            Toast.makeText(this, R.string.toast_input_age, Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        // 通过 Intent 向详情页传递姓名和年龄，供测试校验页面跳转与数据内容。
+        Intent intent = new Intent(this, DetailActivity.class);
+        intent.putExtra(EXTRA_NAME, name);
+        intent.putExtra(EXTRA_AGE, age);
+        startActivityForResult(intent, REQUEST_DETAIL);
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if (requestCode == REQUEST_DETAIL && resultCode == RESULT_OK) {
+            clearInputs();
+        }
+    }
+
+    private void clearInputs() {
+        etName.setText("");
+        etAge.setText("");
+    }
+}

hw4/task3-intent-navigation/app/src/main/res/layout/activity_detail.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="20dp">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="20dp"
+        android:text="@string/title_detail_page"
+        android:textSize="22sp"
+        android:textStyle="bold" />
+
+    <TextView
+        android:id="@+id/tv_name"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="12dp"
+        android:textSize="18sp" />
+
+    <TextView
+        android:id="@+id/tv_age"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="20dp"
+        android:textSize="18sp" />
+
+    <Button
+        android:id="@+id/btn_back"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/action_back" />
+
+</LinearLayout>

hw4/task3-intent-navigation/app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="20dp">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="20dp"
+        android:text="@string/title_input_page"
+        android:textSize="22sp"
+        android:textStyle="bold" />
+
+    <EditText
+        android:id="@+id/et_name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:hint="@string/hint_name"
+        android:inputType="textPersonName" />
+
+    <EditText
+        android:id="@+id/et_age"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="20dp"
+        android:hint="@string/hint_age"
+        android:inputType="number" />
+
+    <Button
+        android:id="@+id/btn_submit"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/action_submit" />
+
+</LinearLayout>

hw4/task3-intent-navigation/app/src/main/res/values/strings.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Task 3 Intent Navigation</string>
+    <string name="title_input_page">信息录入页</string>
+    <string name="title_detail_page">详情展示页</string>
+    <string name="hint_name">请输入姓名</string>
+    <string name="hint_age">请输入年龄</string>
+    <string name="action_submit">提交</string>
+    <string name="action_back">返回</string>
+    <string name="toast_input_name">请输入姓名</string>
+    <string name="toast_input_age">请输入年龄</string>
+    <string name="label_name_value">姓名：%1$s</string>
+    <string name="label_age_value">年龄：%1$s</string>
+</resources>

hw4/task3-intent-navigation/app/src/main/res/values/themes.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Task3IntentNavigation" parent="Theme.AppCompat.Light.NoActionBar" />
+</resources>

hw4/task3-intent-navigation/build.gradle

@@ -0,0 +1,9 @@
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:8.5.0'
+    }
+}

hw4/task3-intent-navigation/gradle.properties

@@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+android.nonTransitiveRClass=true
+org.gradle.java.home=C\:\\Program Files\\Android\\Android Studio\\jbr

hw4/task3-intent-navigation/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

hw4/task3-intent-navigation/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

hw4/task3-intent-navigation/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

hw4/task3-intent-navigation/settings.gradle

@@ -0,0 +1,19 @@
+pluginManagement {
+	repositories {
+		google()
+		mavenCentral()
+		gradlePluginPortal()
+	}
+}
+
+dependencyResolutionManagement {
+	repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+	repositories {
+		google()
+		mavenCentral()
+	}
+}
+
+rootProject.name = 'task3-intent-navigation'
+include ':app'
+