SWING PROGRAM TO IMPLEMENTS CALCULATOR

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package Swing;

/**

 *

 * @author Administrator

 */

import java.awt.Color;

import javax.swing.*;

import java.awt.event.ActionListener;

import java.awt.event.*;

public class Calculator implements ActionListener{

    JFrame fr;

    JPanel p;

    JTextField t1,t2,t3;

    JLabel l1,l2,l3;

    JButton b1,b2,b3,b4,b5;

   

    Calculator()

    {

        fr=new JFrame("CALCULATE");

        p=new JPanel();

        p.setLayout(null);

        l1=new JLabel("Enter First Number : ");

        l2=new JLabel("Enter Second Number : ");

        l3=new JLabel("Result : ");

        t1=new JTextField(20);

        t2=new JTextField(20);

        t3=new JTextField(20);

        b1=new JButton("add");

        b2=new JButton("sub");

        b3=new JButton("mul");

        b4=new JButton("div");

        b5=new JButton("clear");

        l1.setBounds(20, 30, 100,25);

        t1.setBounds(150,30,100,25);

        l2.setBounds(20,60,100,25);

        t2.setBounds(150,60,100,25);

        l3.setBounds(20,90,100,25);

        t3.setBounds(150,90,100,25);

        b1.setBounds(20,150,70,25);

        b2.setBounds(90,150,70,25);

        b3.setBounds(160,150,70,25);

        b4.setBounds(230,150,70,25);

        b5.setBounds(300,150,70,25);

        p.add(l1);

        p.add(t1);

        p.add(l2);

        p.add(t2);

        p.add(l3);

        p.add(t3);

        p.add(b1);

        p.add(b2);

        p.add(b3);

        p.add(b4);

        p.add(b5);

       

        b1.addActionListener(this);

        b2.addActionListener(this);

        b3.addActionListener(this);

        b4.addActionListener(this);

        b5.addActionListener(this);

        fr.add(p);

        fr.addWindowListener(new winclose());

        fr.setSize(800,800);

        fr.setVisible(true);

    }

    public void actionPerformed(ActionEvent e) {

       float a,b,res=0;

       String r;

       String s=e.getActionCommand();

       System.out.println(s);

       a=Float.parseFloat(t1.getText());

       b=Float.parseFloat(t2.getText());

       if(s.equals("add"))

       {

            res=a+b;

       }

       if(s.equals("sub"))

       {

           res=a-b;

       }

       if(s.equals("mul"))

       {

           res=a*b;

       }

       if(s.equals("div"))

       {

           res=a/b;

       }

      

       t3.setText(""+res);

       System.out.println("Result = "+res);

       if(s.equals("clear"))

       {

       t1.setText("");

       t2.setText("");

       t3.setText("");

        }

    }

    public static void main(String args[])

    {

    Calculator obj=new Calculator();

    }

}

class winclose extends WindowAdapter

    {

        @Override

        public void windowClosing(WindowEvent e)

        {

        System.exit(0);

        }

    }