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

• System is a public class.
• out is a stream object defined in System.
  • out is also static.

• Java programs are interpreted on Java Virtual Machine (JVM).

  • OS Independent

  “Write Once, Run Anywhere”

• javac compiles into JVM bytecode. eg: helloworld.java to helloworld.class
• java helloworld interprets and runs the bytecode in helloworld.class.

Note:

1. javac requires file extension .java
2. java should not be provided file extension .class
3. javac automatically follows dependencies and compiles all classes required.