build.gradle for simple Java program

README.md

Gradle: Build Automation Tool

NOTE This method is quite advanced and is not recommended for beginners. It uses Gradle, a build automation tool, to compile and run complex programs that consist of multiple source-code files.

Project structure:

.
├── build.gradle
└── src/
    └── main/
        └── java/
            └── com/
                └── myproject/
                    ├── Main.java
                    └── Greet.java

You can create the project structure manually or use the following command to create the project structure:

mkdir -p src/main/java/com/myproject

1. Create a file named build.gradle and copy the following code into it:

   plugins {
       id 'java'
   }
   
   task execute(type: JavaExec, dependsOn: 'compileJava') {
       main = 'com.myproject.Main'
       classpath = sourceSets.main.runtimeClasspath
   }
   

2. Main.java and Greet.java are located in the src/main/java/com/myproject directory.

   Main.java:

   public class Main {
       public static void main(String[] args) {
           HelloWorld.sayHello();
       }
   }

   Greet.java:

   package com.myproject;
   
   public class Greet {
       public static void sayHello() {
           System.out.println("Hello, World!");
       }
   }

3. Run the program using the gradle command:

   gradle execute

build.gradle

plugins {
    id 'java'
}

task execute(type: JavaExec, dependsOn: 'compileJava') {
    main = 'com.myproject.Main'
    classpath = sourceSets.main.runtimeClasspath
}