import java.io.*;
import java.net.*;

public class PacketReceiver{
    // port
    private static final int PORT = 55524;
    private static final String INET_ADDRESS = "127.0.0.1";

    // data length
    public static final int MAX_LENGTH = 256;

    /**
     * receiver
     */
    protected void receive(){
        try {
            DatagramSocket socket = new DatagramSocket( PORT, InetAddress.getByName(INET_ADDRESS) );
            byte[] data = new byte[MAX_LENGTH];
            DatagramPacket packet= new DatagramPacket( data, MAX_LENGTH );

            while( true ) {
                socket.receive( packet );
                data = packet.getData();
                int length = packet.getLength();
                String message = new String( data, 0, length );
                System.out.println( message );
            }
            
        }catch( SocketException e ) {
            System.err.println( "Socket Error" );
        }catch( IOException e ) {
            System.err.println( "IO Error" );
        }
    }
    
    /**
     * Main method
     */
    public static void main( String argv[] ) {
        PacketReceiver r= new PacketReceiver();
        r.receive();
    }
}