初始化java学习项目

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+.kotlin
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

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+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/encodings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" project-jdk-name="openjdk-25" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.mymcom</groupId>
+    <artifactId>java-learn</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>25</maven.compiler.source>
+        <maven.compiler.target>25</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.2</version>
+            <scope>test</scope>  <!-- 仅在 src/test/java 中可用 -->
+        </dependency>
+
+    </dependencies>
+
+</project>

src/main/java/Main.java

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+import java.util.ArrayList;
+import java.util.Iterator;
+
+public class Main {
+    static String name = "mayiming";
+    static ArrayList<Integer> numlist = new ArrayList<>();
+    public static void main(String[] args) {
+        numlist.add(1);
+        numlist.add(2);
+        numlist.add(3);
+        System.out.println("Hello World"+name);
+        for (Integer integer : numlist) {
+            System.out.println(integer);
+        }
+    }
+
+}

src/test/java/test.java

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+import org.junit.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.Assert.assertEquals;
+
+public class test {
+
+    @Test
+    public void testNumListElements() {
+
+        ArrayList<Integer> testList = new ArrayList<>();
+        testList.add(1);
+        testList.add(2);
+        testList.add(3);
+
+        assertEquals("列表应包含 3 个元素", 3, testList.size());
+
+        assertEquals("第一个元素应为 1", Integer.valueOf(1), testList.get(0));
+        assertEquals("第二个元素应为 2", Integer.valueOf(2), testList.get(1));
+        assertEquals("第三个元素应为 3", Integer.valueOf(3), testList.get(2));
+    }
+
+}