/**
 *  The HelloWorldApp Class impliments an application that displays "Hello World!" to standard output
 */
public class HelloWorldApp
 {
    public static void main (String[] args)
    {
       // Display "Hello World!"
       System.out.println("Hello World!"); // end of line comment
       System.out.println("Hello World!"); /* end of line comment */
       System.out.println("Hello World!/*"); /* end of line comment */
/* this
is
a
multi
line
comment
*/
/* another comment */
// /* is this a valid comment
/*
//  */
       System.out.println("//Hello World!/*"); // is /* this valid
    }
 }