RMI program !!

import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.*;

interface Calculator extends Remote{
    int add(int a, int b) throws RemoteException;
}

class CalculatorImpl extends UnicastRemoteObject implements Calculator{
    CalculatorImpl() throws RemoteException{
    }
    public int add(int a, int b){
        System.out.println("Adding "+a+" and "+b+" .......");
        return a+b;
    }
} 
class ServerApp{
    public static void main(String[] args) throws Exception{
        CalculatorImpl ci=new CalculatorImpl();
        Registry r=LocateRegistry.createRegistry(1099);
        r.bind("abcd", ci);
    }
}
class ClientApp{
    public static void main(String[] args) throws Exception{
        Calculator c=(Calculator)Naming.lookup("abcd");
        System.out.println(c.add(5,6));
    }
}