Create a simple java program for printing "Hello World" message to the output screen.

Method-1:

class HelloWorld{
    //creating main or static method
    public static void main(String[] args){
        //main area or static area
        System.out.println("Hello World!");
      //  System.out.println("This is Ankur Saxena");
    }
}

Save this program as 'HelloWorld.java'.
Compile: $javac HelloWorld.java
Execute: $java HelloWorld

Output:

Hello World!

Method-2:

Using Multiple Classes.

public class HelloWorld1{
    
    public static void main (String[] args){
        
        //creating new object
        Example obj;
        obj = new Example();
        //calling the method
        obj.m1();
    }
}

class Example{
    
    //creating instance method
    void m1(){
        
        System.out.println ("Hello World!");
    }
}

Save this file as 'HelloWorld1.java'.
Compile: $javac HelloWorld1.java
Execution: $java HelloWorld1

Output:

Hello World!

Method-3:

Using Instance Method.

class HelloWorld2{
    
    public static void main(String[] args){
        
        //creating new object
        HelloWorld2 object = new HelloWorld2();
        //calling instance method
        object.m1();
    }
    
    //creating instance method
    void m1(){
        
        System.out.println("Hello World!");
    }
}

Save this program as 'HelloWorld2.java'.
Compile: $javac HelloWorld2.java
Execute: $java HelloWorld2

Output: