compiler

How to compile and run Java programs

Tested on

Operating System	Architecture
macOS Sonoma 14.0	M1 chip
Ubuntu server 22.04	M1 chip

Table of contents

• Tested on
• Single-file source-code programs
  • JAVAC: Java Compiler
• Multi-file source-code programs
  • JAVAC: Java Compiler
  • Gradle: Build Automation Tool

Single-file source-code programs

‍NOTE As a multi-file source-code program you can use Gradle to compile and run complex programs that consist of multiple source-code files. This method is quite advanced and is not recommended for beginners.

JAVAC: Java Compiler

1. Create a file named HelloWorld.java and copy the following code into it:

   public class HelloWorld {
       public static void main(String[] args) {
           System.out.println("Hello, World!");
       }
   }

2. Compile the program using the javac command:

   javac HelloWorld.java

   The javac command creates a file named HelloWorld.class that contains bytecode version of the program.
   

3. Run the program using the java command:

   java HelloWorld

   The program prints the following output:

   

Multi-file source-code programs

JAVAC: Java Compiler

Project structure:

test/
└── src/
    └── com/
        └── myproject/
            ├── Main.java
            └── Greet.java

you can create the project structure manually or use the following command to

mkdir -p src/com/myproject

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

   Main.java:

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

   Greet.java:

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

2. Compile the program using the javac command:

   javac src/com/myproject/*.java

3. Run the program using the java command:

   java -cp src com.myproject.Main

   The program prints the following output:

   

Gradle: Build Automation Tool

‍NOTE Gradle is quite advanced and is not recommended for beginners. You can use JAVAC: Java Compiler to compile and run simple programs.

For more information, see Gradle User Manual

Need assistance? Check out my discussion board or review the GitHub status page.

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