Datagram Client and Server, client timer question

[saru88]

hey,
i'm very new to networking in Java and I'm trying to implement
a datagram client and server. My problem atm is writing a timer for the
client in java so that if the server does not respond within a certain time period then the client's request is resent. Could someone please show me how i would do this :), i have looked at the Timer class but my experimentation with it failed.

This was my experiment, out of curiousity could u tell me why "hello" was
not printed out.

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.Timer;

public class Timers {

	public static void main(String[] args){

		int delay = 1000; //milliseconds
		  ActionListener taskPerformer = new ActionListener() {		     

			@Override
			public void actionPerformed(ActionEvent arg0) {
				System.out.println("hello");
				
			}
		  };
		  new Timer(delay, taskPerformer).start();
	}
}

Thanx :)

[Norm]

It probably is the type of thread that Timer uses. If the main thread exits, the jvm exits and the timer is lost.
Read about daemon threads.
Add a try{Thread.sleep(2000);}catch(Exception x){} // wait
before main exits to see.