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Problem:

How to write “Hello, world!” in Java?

Solution:

  1. Create a package for a class: 
    mkdir -p com/farenda/solved
  2. Create a file com/farenda/solved/HelloWorld.java with content: 
    package com.farenda.solved;

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, world!");
    }
}
  3. Create directory for compiled classes: 
    mkdir classes
  4. Compile source: 
    javac src/com/farenda/solved/HelloWorld.java -d classes
  5. Run compiled code: 
    java -cp classes com.farenda.solved.HelloWorld

Result:

Hello, world!
Share with the World!