How to create RMI Program in Java

import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Computeapp extends Remote
{
Object executeTask(int i)throws RemoteException;
}


import java.rmi.*;
import java.rmi.server.*;
public class ComputeappEngine extends UnicastRemoteObject implements Computeapp
{
    public ComputeappEngine()throws RemoteException
    {
        super();
    }
    public Object executeTask(int i)throws RemoteException
    {
        return i * i;
    }

   
}


import java.rmi.*;

public class Client{

    public static void main(String args[]){
        try{
            Computeapp comp=(Computeapp)Naming.lookup("//localhost/Computeapp");
            System.out.println(comp.executeTask(4));
       
        }
        catch(Exception e){
        System.err.println("computeappEngine Exception"+e.getMessage());
            e.printStackTrace();   
        }
    }
}


import java.rmi.*;
import java.rmi.server.*;
class Server1 extends UnicastRemoteObject{

public Server1()throws RemoteException
    {
       
    }
    public static void main(String args[])throws RemoteException
    {
       

        String names = "//localhost/Computeapp";
        try{

            Computeapp engine = new ComputeappEngine();
            Naming.rebind(names, engine);
            System.out.println("computeappEngine bound");
        }
        catch(Exception e){
            System.err.println("computeappEngine Exception"+e.getMessage());
            e.printStackTrace();
        }
    }
}

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