calculator application using simple java programming -skccs

java program | Create a calculator application with swing.

we need to create a structure  with java swing component 

follow button , textfield, and other

JFrame: The main window/container for the application.

JTextField: Used as the display area for input and results.

JButton: Used for all the numbers (0-9), operators (+, -, *, /), equals         (=), and control buttons (Clear, Delete, etc.).

JPanel: A container often used to organize the buttons using a specific         Layout Manager .
ActionListener: An interface implemented to handle events (button clicks)         from the JButton components.

source code given below:

/* blogger: skccs.blogspot.com

*/


/*
To Create a Calculator by Using java programming

*/

Source Code :

import javax.swing.*;

import java.awt.event.*;

/* class name declare with Action listener */

class calculator implements ActionListener
{
 JFrame f;
 JTextField t;
 JButton b1, b2,b3,b4,b5,b6,b7,b8,b9,b0,badd,bsub,bmul,bdiv,bdec,beq,bdel,bclr;

 static double a=0,b=0,result=0;
 static int operator=0;

 calculator()
 {
  f=new JFrame("Calculator");
  t=new JTextField();

  b1=new JButton("1");
  b2=new JButton("2");
  b3=new JButton("3");
  b4=new JButton("4");
  b5=new JButton("5");
  b6=new JButton("6");
  b7=new JButton("7");
  b8=new JButton("8");
  b9=new JButton("9");
  b0=new JButton("0");

  badd=new JButton("+");
  bsub=new JButton("-");
  bmul=new JButton("*");
  bdiv=new JButton("/");
  bdec=new JButton(".");
  beq=new JButton("=");
  bdel=new JButton("Delete");
  bclr=new JButton("Clear");

  t.setBounds(30,40,280,30);

  b7.setBounds(40,100,50,40);
  b8.setBounds(110,100,50,40);
  b9.setBounds(180,100,50,40);
  bdiv.setBounds(250,100,50,40);

  b4.setBounds(40,170,50,40);
  b5.setBounds(110,170,50,40);
  b6.setBounds(180,170,50,40);
  bmul.setBounds(250,170,50,40);

  b1.setBounds(40,240,50,40);
  b2.setBounds(110,240,50,40);
  b3.setBounds(180,240,50,40);
  bsub.setBounds(250,240,50,40);

  bdec.setBounds(40,310,50,40);
  b0.setBounds(110,310,50,40);
  beq.setBounds(180,310,50,40);
  badd.setBounds(250,310,50,40);

  bdel.setBounds(60,380,100,40);
  bclr.setBounds(180,380,100,40);


  f.add(t);
  f.add(b7);
  f.add(b8);
  f.add(b9);
  f.add(bdiv);

  f.add(b4);
  f.add(b5);
  f.add(b6);
  f.add(bmul);

  f.add(b1);
  f.add(b2);
  f.add(b3);
  f.add(bsub);

  f.add(bdec);
  f.add(b0);
  f.add(beq);
  f.add(badd);


  f.add(bdel);
  f.add(bclr);

  f.setLayout(null);
  f.setVisible(true);
  f.setSize(350,500);
  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  f.setResizable(true);

  b1.addActionListener(this);
  b2.addActionListener(this);
  b3.addActionListener(this);
  b4.addActionListener(this);
  b5.addActionListener(this);
  b6.addActionListener(this);
  b7.addActionListener(this);
  b8.addActionListener(this);
  b9.addActionListener(this);
  b0.addActionListener(this);
  badd.addActionListener(this);
  bsub.addActionListener(this);
  bmul.addActionListener(this);
  bdiv.addActionListener(this);
  bdec.addActionListener(this);
  beq.addActionListener(this);
  bdel.addActionListener(this);
  bclr.addActionListener(this);
  

 }

 public  void actionPerformed(ActionEvent e)
 {
  if(e.getSource()==b1)
   t.setText(t.getText().concat("1"));

  if(e.getSource()==b2)
   t.setText(t.getText().concat("2"));

  if(e.getSource()==b3)
   t.setText(t.getText().concat("3"));

  if(e.getSource()==b4)
   t.setText(t.getText().concat("4"));

  if(e.getSource()==b5)
   t.setText(t.getText().concat("5"));

  if(e.getSource()==b6)
   t.setText(t.getText().concat("6"));

  if(e.getSource()==b7)
   t.setText(t.getText().concat("7"));

  if(e.getSource()==b8)
   t.setText(t.getText().concat("8"));

  if(e.getSource()==b9)
   t.setText(t.getText().concat("9"));

  if(e.getSource()==b0)
   t.setText(t.getText().concat("0"));


  if(e.getSource()==bdec)
   t.setText(t.getText().concat("."));


  if(e.getSource()==badd)
  {
   a=Double.parseDouble(t.getText());
   operator=1;
   t.setText("");
  }


  if(e.getSource()==bsub)
  {
   a=Double.parseDouble(t.getText());
   operator=2;
   t.setText("");
  }


  if(e.getSource()==bmul)
  {
   a=Double.parseDouble(t.getText());
   operator=3;
   t.setText("");
  }


  if(e.getSource()==bdiv)
  {
   a=Double.parseDouble(t.getText());
   operator=4;
   t.setText("");
  }




  if(e.getSource()==beq)
  {
   b=Double.parseDouble(t.getText());
   
   switch(operator)
   
   {
    case 1:result=a+b;
    break;
   

   
    case 2:result=a-b;
    break;
   
   
    case 3:result=a*b;
    break;
   
   
    case 4:result=a/b;
    break;

    default:result=0;
   }

   t.setText(""+result);
  }
  

  if (e.getSource()==bclr)
  
   t.setText("");
  

  if (e.getSource()==bdel)
   {
   String s=t.getText();
   t.setText("");

   for (int i=0;i<s.length()-1 ;i++ )
   
    t.setText(t.getText()+s.charAt(i));
   
   
   }
 }
 public static void main(String[] args) {
  new calculator();
 }
}

    save as the  source code with class_name.java 
 (this program in the class name =calculator i.e calculator.java)

after the saving source code open command line 

A . for windows os user

   step I.
                 open the  cmd command prompt
                 set directory where you have save source code file (for change directory to use cd                                    command)

  step II.  for run java program enter command javac class_name.java 

                so this program class name =calculator 

                hence enter command "javac calculator.java

  step III. after compile  without error
                 then  executes for  command line  enter java class_name (without .java extension)
                  just enter command line java calculator


B .  for Linux os user

   step I.
               open terminal command line  
          (shortcut keys for open terminal command in linux ="ctrl + Alt  + T)

          set directory where you have save source code file

           for change directory to use cd file_name command

          for example i have saved the source code on Desktop
          

          so i used command cd Desktop

          just see in below image

   step II.
                for run java program enter command javac class_name.java 

                so this program class name =calculator 

                hence enter command "javac calculator.java
             
               just see in below image :

      step III.
                  after compile  without error

                  then  executes for  command line  enter java class_name (without .java extension)

                  just enter command line java calculator

after execution complete show your calculator apps on your monitor

image show in below as like

   

**** if you have any problem in source code then please comment ****