[levent]

You can do this with DatagramSocket.

You can use the socket like this:

Code:

 
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class MainClass {

  public static void main(String[] args) {

    try {

      String data = "data in UDP";
      byte [] buffer = data.getBytes();

      DatagramPacket packet = new DatagramPacket(buffer, buffer.length,
                new InetSocketAddress("localhost", 5002));

      DatagramSocket socket = new DatagramSocket(5003);

      System.out.println("Sending a packet...");
      socket.send(packet);

    }catch(IOException e)
    {
      e.printStackTrace();
    }
  }
}

And for broadcasting your message, you should enable SO_BROADCAST using setBroadcast(boolean on) method.