Simple Date/Time Question

Question

ok so I can print out the date and time when i run the program.
How would I write a method that updated the clock every second, kinda like a digital watch. would I just use a while loop? or does java have an actual running clock?
Here is the code I have so far:
import java.util.Date;
public class DateTime
     Date now = new Date();
     public DateTime()
          System.out.println(now);
      public static void main(String[] args)
           DateTime run = new DateTime();
}

Answer 1

import java.util.Date;
public class DateTime
     Date now = new Date();
     public DateTime()
     {while(true){
          System.out.println(now);now = new Date();
Thread.sleep(1000);
     public static void main(String[] args)
          DateTime run = new DateTime();
I modified your code a bit better do this in a different thread though if you plan to use a GUI