import java.io.*;
import java.net.*;
public class UdpClient { 
  public void go() throws IOException, UnknownHostException {
    DatagramSocket datagramSocket;
    DatagramPacket inDataPacket;
    DatagramPacket outDataPacket;
    InetAddress serverAddress;
    byte[] msg = new byte[100];
    String receivedMsg;
    datagramSocket = new DatagramSocket();
    serverAddress = InetAddress.getLocalHost();
    outDataPacket = new DatagramPacket(msg,1, serverAddress, 8000);
    datagramSocket.send (outDataPacket);
    inDataPacket = new DatagramPacket(msg, msg.length);
    datagramSocket.receive(inDataPacket);
    receivedMsg = new String (inDataPacket.getData(), 0,inDataPacket.getLength());
    System.out.println(receivedMsg);
    datagramSocket.close();    
  }
  public static void main (String args[]) {
    UdpClient udpClient = new UdpClient();
    try {
      udpClient.go();
    } 
    catch (Exception e) {
      System.out.println ("Exception occurred with socket.");
      System.out.println (e);
      System.exit (1);
    }
  }
}