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

public class UDPEchoClient {

  public final static int DEFAULT_PORT = 7;

  public static void main(String[] args) {

    String hostname = "localhost";
    int port = DEFAULT_PORT;

    if (args.length > 0) {
      hostname = args[0];
    }
    if (args.length > 1) {
      try {
        port = Integer.parseInt(args[1]);
      }
      catch (Exception e) {}
    }

    try {
      InetAddress ia = InetAddress.getByName(hostname);
      SenderThread sender = new SenderThread(ia, DEFAULT_PORT);
      sender.start();
      ReceiverThread receiver = new ReceiverThread(sender.getSocket());
      receiver.start();
    }
    catch (UnknownHostException e) {
      System.err.println(e);
    }
    catch (SocketException se) {
      System.err.println(se);
    }

  }  // end main

}