import java.io.*;
import java.net.*;
import java.util.*;
import sun.net.*;

class UDPListener {
    public static void main(String argv[]) {
	try {
	    DatagramSocket s = new DatagramSocket();
	    System.out.print("UDPListener Server listening on port:");
	    System.out.println(s.getLocalPort());
	    byte buf[] = new byte[10];
	    DatagramPacket dp = new DatagramPacket(buf, 10);
	    s.receive(dp);
	    System.out.println("Received from inet address: "
			     + dp.getAddress().toString());
	    System.out.print(" port number: ");
	    System.out.print(dp.getPort());

	    for (int i=0; i<buf.length; ++i)  System.out.println(buf[i]);
	    s.close();
	} catch (Exception e) {
	    e.printStackTrace();
	}
    }
}