Dis Practical-2

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

public interface Calculator extends Remote {
    double add(double a, double b) throws RemoteException;

    double subtract(double a, double b) throws RemoteException;

    double multiply(double a, double b) throws RemoteException;

    double divide(double a, double b) throws RemoteException;
}

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class CalculatorClient {
    public static void main(String[] args) {
        try {
            Registry registry = LocateRegistry.getRegistry("localhost", 1099);
            Calculator stub = (Calculator) registry.lookup("CalculatorService");
            System.out.println("Addition: " + stub.add(5, 3));
            System.out.println("Subtraction: " + stub.subtract(5, 3));
            System.out.println("Multiplication: " + stub.multiply(5, 3));
            System.out.println("Division: " + stub.divide(5, 3));
        } catch (Exception e) {
            System.err.println("Client exception: " + e.toString());
            e.printStackTrace();
        }
    }
}

import java.rmi.server.UnicastRemoteObject;
import java.rmi.RemoteException;

public class CalculatorImpl extends UnicastRemoteObject implements Calculator {
    protected CalculatorImpl() throws RemoteException {
        super();
    }

    @Override
    public double add(double a, double b) throws RemoteException {
        return a + b;
    }

    @Override
    public double subtract(double a, double b) throws RemoteException {
        return a - b;
    }

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

    @Override
    public double divide(double a, double b) throws RemoteException {
        if (b == 0)
            throw new ArithmeticException("Division by zero is not allowed.");
        return a / b;
    }
}

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class CalculatorServer {
    public static void main(String[] args) {
        try {
            CalculatorImpl calc = new CalculatorImpl();
            Registry registry = LocateRegistry.createRegistry(1099); // Default RMI port
            registry.rebind("CalculatorService", calc);
            System.out.println("Calculator Service is running...");
        } catch (Exception e) {
            System.err.println("Server exception: " + e.toString());
            e.printStackTrace();
        }
    }
}