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

public class MulticastSender {

  public static void main(String[] args) {
  
    InetAddress ia = null;
    int port = 0;
    String characters = "Here's some multicast data\n";
    byte[] data = new byte[characters.length()];

  
    // read the address from the command line
    try {
      try {
        ia = InetAddress.getByName(args[0]);
      }
      catch (UnknownHostException e)  {
        ia = InetAddressFactory.newInetAddress(args[0]);
      }
      port = Integer.parseInt(args[1]);
    }
    catch (Exception e)  {
      System.err.println(e);
      System.err.println("Usage: java MulticastSender MulticastAddress port");
      System.exit(1);
    }
  
    characters.getBytes(0, characters.length(), data, 0);
    DatagramPacket dp = new DatagramPacket(data, data.length, ia, port);
  
    try {
      MulticastSocket ms = new MulticastSocket();
      ms.joinGroup(ia);
      for (int i = 1; i < 10; i++) {
        ms.send(dp, (byte) 1);
      }
      ms.leaveGroup(ia);
      ms.close();
    }
    catch (SocketException se) {
      System.err.println(se);
    }
    catch (IOException ie) {
      System.err.println(ie);
    }  
  
  }

}