7. simple calculator

Write a Java program that works as a simple calculator. Use a grid layout to arrange buttons for the digits and for the +, -,*, % operations. Add a text field to display the result.

//

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Calculator extends Applet implements ActionListener

{

JTextField t1,t2,t3;

JLabel l1,l2,l3;

JButton b1,b2,b3,b4;

JPanel p1,p2;

public void init()

{

p1=new JPanel();

p2=new JPanel();

p1.setBackground(Color.gray);

p2.setBackground(Color.gray);

setBackground(Color.lightGray);

l1=new JLabel("Enter the First number :");

p1.add(l1);

t1=new JTextField(10);

p1.add(t1);

l2=new JLabel("Enter the Second number :");

p1.add(l2);

t2=new JTextField(10);

p1.add(t2);

l3=new JLabel("Result");

p1.add(l3);

t3=new JTextField(10);

p1.add(t3);

b1=new JButton("ADD");

p2.add(b1);

b1.addActionListener(this);

b2=new JButton("SUB");

p2.add(b2);

b2.addActionListener(this);

b3=new JButton("MUL");

p2.add(b3);

b3.addActionListener(this);

b4=new JButton("DIVISION");

p2.add(b4);

b4.addActionListener(this);

add(p1,BorderLayout.NORTH);

add(p2,BorderLayout.CENTER);

t1.setBackground(Color.yellow);

t2.setBackground(Color.yellow);

t3.setBackground(Color.yellow);

}

public void actionPerformed(ActionEvent ae)

{

try

{

if (ae.getSource()==b1)

{

int x=Integer.parseInt(t1.getText());

int y=Integer.parseInt(t2.getText());

int sum=x+y;

t3.setText(" "+sum);

}

if (ae.getSource()==b2)

{

int x=Integer.parseInt(t1.getText());

int y=Integer.parseInt(t2.getText());

int sub=x-y;

t3.setText(" "+sub);

}

if (ae.getSource()==b3)

{

int x=Integer.parseInt(t1.getText());

int y=Integer.parseInt(t2.getText());

int mul=x*y;

t3.setText(" "+mul);

}

if (ae.getSource()==b4)

{

int x=Integer.parseInt(t1.getText());

int y=Integer.parseInt(t2.getText());

int div=x/y;

t3.setText(" "+div);

}

}

catch (Exception e)

{

JOptionPane.showMessageDialog(null,e);

}

}

}