Initial simple Java project

.gitea/workflows/java-build.yml

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+name: Java Build
+
+on:
+  push:
+    branches: [ main, master ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: android
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Build with Gradle
+      run: |
+        java -version
+        gradle --version
+        gradle build --no-daemon
+        echo "构建成功！"
+    
+    - name: Upload JAR
+      uses: actions/upload-artifact@v4
+      with:
+        name: hello-world
+        path: build/libs/*.jar

build.gradle

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+plugins {
+    id 'java'
+}
+
+group = 'com.example'
+version = '1.0'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation 'junit:junit:4.13.2'
+}
+
+jar {
+    manifest {
+        attributes 'Main-Class': 'com.example.HelloWorld'
+    }
+}

src/main/java/com/example/HelloWorld.java

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+package com.example;
+
+public class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello from Gitea Actions!");
+    }
+}