Calculator in Java

This is One simple calculator using java swing so.. enjoy it....

her all buttons and textbox are put in panel so every row in calculator its separate on panel.
This calculator made by me during 7th semester.

Realy java is my favourite Language . so

Steps for run Below code:-

 1) Copy below code in notepade
 2) Save this file as cal.java
 3) open cmd and goto path of cal.java
 4) Now Firts compile it using below command
        javac cal.java
 5) and run it using following cammand
        java cal.java


Code:
File : cal.java


import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.applet.*;

/*
<applet code="cal" width=250 height=300>
</applet>
*/

class calc extends JFrame implements ActionListener  
{  
 FlowLayout fl;
 GridLayout gr;
  JPanel p1,p2,p3,p4,p5,p6,p7,p8,p9;
 JButton b[],plus,eql,minus,mul,div,ce;
 JTextField t1;
 int a,c,r=0;
 String s="";
 public calc()
           {
gr = new GridLayout(8,1);
setLayout(gr);
fl = new FlowLayout(0); 
p1 = new JPanel();
                        p1.setLayout(fl);
t1 = new JTextField(15);
p1.add(t1); 
add(p1);
b = new JButton[10];
for(int i=0;i<10;i++)
{
b[i] = new JButton(    String.valueOf(i)    );
  }
      p3 = new JPanel();
                                p3.setLayout(fl);
plus = new JButton("+");
plus.addActionListener(this);
p3.add(plus);
ce = new JButton("      CE        ");
ce.addActionListener(this);
p3.add(ce);
add(p3);
p4 = new JPanel();
               p4.setLayout(fl);
mul = new JButton("* ");
mul.addActionListener(this);
p4.add(mul); 
div = new JButton("/ ");
div.addActionListener(this);
p4.add(div);
minus = new JButton(" -");
minus.addActionListener(this);
p4.add(minus);
add(p4);
p5 = new JPanel();
                                p5.setLayout(fl);
p5.add(  b[7]  );
b[7].addActionListener(this);
p5.add(  b[8]  );
b[8].addActionListener(this);
p5.add(  b[9]  );
b[9].addActionListener(this);
add(p5);
p6 = new JPanel();
                                p6.setLayout(fl);
p6.add(b[4]);
b[4].addActionListener(this);
p6.add(b[5]);
b[5].addActionListener(this);
p6.add(b[6]);
b[6].addActionListener(this); 
add(p6);
p7 = new JPanel();
                                p7.setLayout(fl);
p7.add(b[1]);
b[1].addActionListener(this);
p7.add(b[2]);
b[2].addActionListener(this);
p7.add(b[3]);
b[3].addActionListener(this); 
add(p7);
p8 = new JPanel();
                        p8.setLayout(fl);
p8.add(b[0]); 
b[0].addActionListener(this);
eql = new JButton("        =         ");
eql.addActionListener(this);
p8.add(eql);
add(p8);
setTitle("O@K Tech. RVS");
setLocation(100,100);
setSize(200,300);
               setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
  }
public void actionPerformed(ActionEvent e)
{
for(int i=0; i<b.length; i++)
{
if(e.getSource() == b[i])
{
switch(i)
{
case 0:
s=s+"0";
break;
case 1:
s=s+"1";
break;
case 2:
s=s+"2";
break;
case 3:
s=s+"3";
break;
case 4:
s=s+"4";
break;
case 5:
s=s+"5";
break;
case 6:
s=s+"6";
break;
case 7:
s=s+"7";
break;
case 8:
s=s+"8";
break;
case 9:
s="9";
break;
}
t1.setText(s);
}
}
if(e.getSource() == plus)
{
a=Integer.parseInt(s);
s="";
t1.setText("");
r=1;
}
else if(e.getSource() == minus)
{
a=Integer.parseInt(s);
s="";
t1.setText("");
r=2;
}
else if(e.getSource() == mul)
{
a=Integer.parseInt(s);
s="";
t1.setText("");
r=3;
}
else if(e.getSource() == div)
{
a=Integer.parseInt(s);
s="";
t1.setText("");
r=4;
}
else if(e.getSource() == ce)
{
s="";
t1.setText("");
}
else if(e.getSource() == eql)
{
switch(r)
{
       case 1:
c = a + Integer.parseInt(t1.getText());
break;
      case 2:
c = a - Integer.parseInt(t1.getText());
break;
      case 3:
c = a * Integer.parseInt(t1.getText());
break;
      case 4:
c = a / Integer.parseInt(t1.getText());
break;  
}
t1.setText(""+c);
}
}
}
public class cal
{
public static void main(String args[])
{
calc cl = new calc();
}
}


Output of Program:

Download .jar file