import java.net.*;
import java.io.*;
public class MulticastPeer{
	public static void main(String args[]){
   	 // args give message contents & destination multicast group (e.g. "228.5.6.7")
	    try {
	   	InetAddress group = InetAddress.getByName(args[1]);
	    	MulticastSocket s = new MulticastSocket(6789);
	   	s.joinGroup(group);
 	    	byte [] m = args[0].getBytes();
	    	DatagramPacket messageOut =
			new DatagramPacket(m, m.length, group, 6789);
	    	s.send(messageOut);


	    // get messages from others in group
	    	byte[] buffer = new byte[1000];
 	   	for(int i=0; i< 3; i++) {
 		    DatagramPacket messageIn =
			new DatagramPacket(buffer, buffer.length);
 		    s.receive(messageIn);
 		    System.out.println("Received:" + new String(messageIn.getData()));
  	     	}
	    	s.leaveGroup(group);
 	    }catch (SocketException e){System.out.println("Socket: " + e.getMessage());
	   }catch (IOException e){System.out.println("IO: " + e.getMessage());}
    }
}