import java.rmi.*;/** * This is a remote interface for illustrating RMI  * client callback. * @author M. L. Liu */public interface CallbackClientInterface   extends java.rmi.Remote{  // This remote method is invoked by a callback  // server to make a callback to an client which  // implements this interface.  // @param message - a string containing information for the  //                  client to process upon being called back.    public String notifyMe(String message)       throws java.rmi.RemoteException;} // end interface