Question

Write down java program to implement the functionality of remote calculator

Answer 1

ANSWER
............



//mathServer//


import java.rmi.*;


import java.rmi.Naming.*;


import java.rmi.server.*;


import java.rmi.registry.*;


import java.net.*;


import java.util.*;

interface mathInterface extends Remote



{



public int add(int a,int b) throws RemoteException;


public int subt(int a,int b) throws RemoteException;


public int mult(int a,int b) throws RemoteException;




public int div(int a,int b) throws RemoteException;



}

public class mathServer extends UnicastRemoteObject implements
mathInterface




{



public mathServer() throws RemoteException
{



System.out.println("Initializing Server");
}





public int add(int a,int b)
{




return(a+b);
}




public int subt(int a,int b)
{




return(a-b);
}




public int mult(int a,int b)
{



return(a*b);
}
public int div(int a,int b)
{
return(a/b);
}
public static void main(String args[])
{
try
{
mathServer ms=new mathServer();



java.rmi.Naming.rebind("MathServ",ms);



System.out.println("Server Ready");



}



catch(RemoteException RE)
{


System.out.println("Remote Server Error:"+ RE.getMessage());



System.exit(0);
}
catch(MalformedURLException ME)
{
System.out.println("Invalid URL!!");
}
}
}



_______//mathClient//. ________
import java.rmi.*;


import java.rmi.registry.*;


import java.awt.*;


import java.awt.event.*;



public class mathClient extends Frame implements ActionListener


{


------------------------
Button B1=new Button("Sum");


Button B2=new Button("Subtract");


Button B3=new Button("Multiply");


Button B4=new Button("Divide");




******************************
Label l1=new Label("Number 1");



Label l2=new Label("Number 2");


Label l3=new Label("Result");

***********



TextField t1=new TextField(20);


TextField t2=new TextField(20);



TextField t3=new TextField(20);



public mathClient()


{
super("Calculator");



setLayout(null);


l1.setBounds(20,50,55,25);


add(l1);
l2.setBounds(20,100,55,25);


add(l2);
l3.setBounds(20,150,55,25);
add(l3);


t1.setBounds(150,50,100,25);
add(t1);


t2.setBounds(150,100,100,25);
add(t2);


t3.setBounds(150,150,100,25);
add(t3);


B1.setBounds(20,200,80,25);
add(B1);


B2.setBounds(100,200,80,25);
add(B2);



B3.setBounds(180,200,80,25);
add(B3);


B4.setBounds(260,200,80,25);
add(B4);


B1.addActionListener(this);
B2.addActionListener(this);
B3.addActionListener(this);
B4.addActionListener(this);
addWindowListener(
new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
}
public void actionPerformed(ActionEvent AE)
{
if(AE.getSource()==B1)
{
sum();
}
else if(AE.getSource()==B2)
{
subt();
}
else if(AE.getSource()==B3)
{
mult();
}
else if(AE.getSource()==B4)
{
div();
}
}
public void sum()
{
int i=Integer.parseInt(t1.getText());
int j=Integer.parseInt(t2.getText());
int val;
try
{
String ServerURL="MathServ";
mathInterface MI=(mathInterface)Naming.lookup(ServerURL);
val=MI.add(i,j);
t3.setText(""+val);
}
catch(Exception ex)
{
System.out.println("Exception:"+ex);
}
}
public void subt()
{
int i=Integer.parseInt(t1.getText());
int j=Integer.parseInt(t2.getText());
int val;
try
{
String ServerURL="MathServ";
mathInterface MI=(mathInterface)Naming.lookup(ServerURL);
val=MI.subt(i,j);
t3.setText(""+val);
}
catch(Exception ex)
{
System.out.println("Exception:"+ex);
}
}
public void mult()
{
int i=Integer.parseInt(t1.getText());
int j=Integer.parseInt(t2.getText());
int val;
try
{
String ServerURL="MathServ";
mathInterface MI=(mathInterface)Naming.lookup(ServerURL);
val=MI.mult(i,j);
t3.setText(""+val);
}
catch(Exception ex)
{
System.out.println("Exception:"+ex);
}
}
public void div()
{
int i=Integer.parseInt(t1.getText());
int j=Integer.parseInt(t2.getText());
int val;
try
{
String ServerURL="MathServ";
mathInterface MI=(mathInterface)Naming.lookup(ServerURL);
val=MI.div(i,j);
t3.setText(""+val);
}
catch(Exception ex)
{
System.out.println("Exception:"+ex);
}
}
public static void main(String args[])
{
mathClient MC=new mathClient();
MC.setVisible(true);
MC.setSize(600,500);
};
}