program of Calculator in java

/**********************Calculator in java AWT******************************/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class Calculator implements ActionListener,WindowListener
{

        String data= "0",opr;
  int number, first_number, result;

       
 Frame f;
 Button b[]=new Button [10];
 Button b1[]= new Button [6];

 TextField tf;
 
 Calculator()
 {
   f= new Frame("Calculator");
   tf= new TextField("");

   for(int i=0;i<10;i++)
    {
  String str= Integer.toString(i);
b[i]= new Button(str);
     }
 
   b1[0]= new Button("+");
   b1[1]= new Button("-");
   b1[2]= new Button("*");
   b1[3]= new Button("/");
   b1[4]= new Button("C");
   b1[5]= new Button("=");

 
 }

 void display()
 {

  try{
  int left,top, hight,width;
   left=20;
   top=80;
   hight=30;
   width=30;

 f.setLayout(null);
//  f.setSize(220,250);
 f.setBounds(350,250,220,250);
  f.setVisible(true);



  for(int i=1;i<10;i++)
{
     
      b[i].setBounds(left,top,width,hight);

if(i%3==0)
{
top=top+40;
left= 20;
}
       
else
left=left+40;
             
    }


b[0].setBounds(left+40,top,width,hight);
   
b1[0].setBounds(left+120,80,width*2,hight);
b1[1].setBounds(left+120,120,width*2,hight);
b1[2].setBounds(left+120,160,width*2,hight);
b1[3].setBounds(left+120,200,width*2,hight);
b1[4].setBounds(left,200,width,hight);
b1[5].setBounds(left+80,200,width,hight);


tf.setBounds(left,40,180,hight);

for(int i=0;i<10;i++)
  f.add(b[i]);

for(int i=0;i<6;i++)
  f.add(b1[i]);


f.add(tf);


for(int i=0;i<10;i++)
b[i].addActionListener(this);

for(int i=0;i<6;i++)
b1[i].addActionListener(this);
f.addWindowListener(this);
  }
 catch(Exception e)
{
System.out.println(e);
}
 }


/**************************************Window Listener Interface************************/

public void windowActivated(WindowEvent e)
{}
public void windowClosed(WindowEvent e)
{}
public void windowClosing(WindowEvent e)
{

System.exit(1);

}
public void windowDeactivated(WindowEvent e)
{}
public void windowDeiconified(WindowEvent e)
{}
public void windowIconified(WindowEvent e)
{}
public void windowOpened(WindowEvent e)
{}





public void actionPerformed(ActionEvent e)
{


try{

if(e.getSource()==b[0])        
{
number=(number*10)+0;
data=Integer.toString(number);
tf.setText(data);

}
else if(e.getSource()==b[1])        
{
number=(number*10)+1;
data=Integer.toString(number);
tf.setText(data);

}
else if(e.getSource()==b[2])        
{
number=(number*10)+2;
data=Integer.toString(number);
tf.setText(data);

}

else if(e.getSource()==b[3])        
{
number=(number*10)+3;
data=Integer.toString(number);
tf.setText(data);

}

else if(e.getSource()==b[4])        
{
number=(number*10)+4;
data=Integer.toString(number);
tf.setText(data);

}

else if(e.getSource()==b[5])        
{
number=(number*10)+5;
data=Integer.toString(number);
tf.setText(data);

}

else if(e.getSource()==b[6])        
{
number=(number*10)+6;
data=Integer.toString(number);
tf.setText(data);

}
else if(e.getSource()==b[7])        
{
number=(number*10)+7;
data=Integer.toString(number);
tf.setText(data);

}
else if(e.getSource()==b[8])        
{
number=(number*10)+8;
data=Integer.toString(number);
tf.setText(data);

}

else if(e.getSource()==b[9])        
{
number=(number*10)+9;
data=Integer.toString(number);
tf.setText(data);

}
else if(e.getSource()==b1[4])
{

}


/**************************************************************************/
if(e.getSource()==b1[0])
{
opr="+";
first_number=number;
number=0;
}
else if(e.getSource()==b1[1])
{
opr="-";
first_number=number;
number=0;
}
else if(e.getSource()==b1[2])
{
opr="*";
first_number=number;
number=0;
}
else if(e.getSource()==b1[3])
{
opr="/";
first_number=number;
number=0;
}
else if(e.getSource()==b1[4])
{
opr=" ";
number=0;
first_number=0;
result=0;
tf.setText(" ");
}
else if(e.getSource()==b1[5])
{
if(opr.equals("+"))
{
result=number+first_number;
data=Integer.toString(result);
tf.setText(data);
number=result;
result=first_number;
}

else if(opr.equals("-"))
{
result=number-first_number;
data=Integer.toString(result);
tf.setText(data);
number=result;
result=first_number;
}
else if(opr.equals("*"))
{
result=number*first_number;
data=Integer.toString(result);
tf.setText(data);
number=result;
result=first_number;
}

else if(opr.equals("/"))
{
result=number+first_number;
data=Integer.toString(result);
tf.setText(data);
first_number=result;
result=number;
}
}


   }
catch(Exception ex)
{
System.out.println(ex);
}

}


}

//****************************************************************************

class CalculatorTest
{
 public static void main(String args[])
 {
 Calculator c= new Calculator();
 c.display();
 }
}

/***************************Pic of Calculator*****************************************/

/******************Download the Zip file of above program********************************/
Download the Zip file of Calculator