RMI

import java.rmi.*;
public interface Stationery extends Remote
{
    public boolean available(String prod)throws RemoteException;
    int bill(String prod,int qty)throws RemoteException;
    String goodbye()throws RemoteException;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
import java.rmi.*;
import java.rmi.server.*;
public class StationeryImplementation extends UnicastRemoteObject implements Stationery
{
    String products[]={"Pen","Apsara Pencil","Natraj Pencil"};
    int quanty[]={10,10,10};
    int price[]={100,5,4};
    StationeryImplementation()throws RemoteException
    {

    }
    public boolean available(String prod)throws RemoteException
    {
        for(int i=0;i<products.length;i++)
            if(prod.equalsIgnoreCase(products[i]))
                return true;
        return false;
    }
    public int bill(String prod,int qty)throws RemoteException
    {
        int amount=0;
        for(int i=0;i<products.length;i++)
            if(prod.equalsIgnoreCase(products[i]))
                if(qty<=quanty[i])
                {
                    amount+=price[i]*qty;
                }
        return amount;
    }
    public String goodbye()throws RemoteException
    {
        return "Thank You";
    }
}////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


import java.rmi.*;
import java.rmi.server.*;
public class StationeryServer
{
    public static void main(String args[])throws Exception
    {
        StationeryImplementation si=new StationeryImplementation();
        Naming.rebind("Stats",si);
    }
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

import java.rmi.*;
import java.io.*;
public class StationeryClient
{
    public static void main(String args[])throws Exception
    {
        Stationery st=(Stationery)Naming.lookup("rmi://localhost/Stats");
        System.out.println(st.available("Pen"));
        System.out.println(st.bill("Pen",5));
        System.out.println(st.goodbye());
    }
}