public class HelloTester
{
   public static void main(String[] args)
   {
       String greeting = "Hello World";
       String myName = "John Doe";
       String message;

       System.out.println( greeting.replace("World", myName) );

       message = greeting.replace("e", "a");
       message = message.replaceAll("l", "r");
       message = message.replace("o", "y");
       System.out.println( message.replace("Wyrrd", myName) );
   }
}