javaME useful code with the J2ME helpful learning cla

				package datagram;
				
				import javax.microedition.io.Datagram;
				import javax.microedition.io.DatagramConnection;
				public class Sender extends Thread
				{
				private DatagramConnection dc;
				private String address;
				private String message;
				public Sender(DatagramConnection dc)
				{
				this.dc = dc;
				start();
				}
				public synchronized void send(String addr, String msg)
				{
				address = addr;
				message = msg;
				notify();
				}
				public synchronized void run()
				{
				while (true)
				{
				// If no client to deal, wait until one connects
				if (message == null)
				{
				try
				{
				wait();
				} catch (InterruptedException e)
				{
				}
				}
				try
				{
				byte[] bytes = message.getBytes();
				Datagram dg = null;
				// Are we a sender thread for the client ? If so then there's
				 
				// no address parameter
				if (address == null)
				{
				dg = dc.newDatagram(bytes, bytes.length);
				} else
				{
				dg = dc.newDatagram(bytes, bytes.length, address);
				System.out.println(address);
				}
				dc.send(dg);
				} catch (Exception ioe)
				{
				ioe.printStackTrace();
				}
				// Completed client handling, return handler to pool and
				// mark for wait
				message = null;
				}
				}
				}