<code java>
package chatMulticast;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class Chat {

	public static void main(String[] args) {	
		
		try {
			InetAddress chatAddress = InetAddress.getByName(args[0]);
			int port = Integer.parseInt(args[1]);
			CopyIn copyIn = new CopyIn(chatAddress,port);
			CopyOut copyOut = new CopyOut(chatAddress,port);
			copyIn.start();
			copyOut.start();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}

	}

}
</code>