Notes

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface Calculator extends Remote{

double multiply(double a, double b) throws RemoteException;
}
package server;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class CalculatorImpl extends UnicastRemoteObject implements Calculator {

public CalculatorImpl() throws RemoteException{
super();
}


@Override
public double multiply(double a, double b) throws RemoteException {
return a * b;
}



}
package server;
import java.net.MalformedURLException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.Naming;

public class CalculatorServer {
public static void main(String[] args) {
try {
LocateRegistry.createRegistry(1099);
// server is running at port 1099
// adding server object to registry

Calculator calc = new CalculatorImpl(); // server object
// we have to register the server object to RMI Registry
// createRegistry() takes int parameter i.e port number


Naming.rebind("rmi://localhost/CalculatorServer", calc);
System.out.println("Server is running...");
} catch (MalformedURLException | RemoteException e) {
System.out.println("Error: " + e.getMessage());
}

}
}
package client;
import java.net.MalformedURLException;
import java.rmi.RemoteException;
import java.rmi.registry.Registry;
import java.rmi.registry.LocateRegistry;
import server.Calculator;
import java.rmi.Naming;
import java.rmi.NotBoundException;

public class CalculatorClient {
public static void main(String[] args) {
try {
// creating client i.e stub object to invoke remote method
Calculator stub = (Calculator) Naming.lookup("rmi://localhost/CalculatorServer") ;

// invoking remote method

double product = stub.multiply(12, 6);

System.out.println("Product of two number: " + product);
} catch (NotBoundException | MalformedURLException | RemoteException e) {
System.out.println("Error: " + e.getMessage());
}
}
}