Calculator Program using Java Swing

Here we will learn to make a simple calculator program using Java Swing. It is a simple program, in which we will perform basic mathematical operations like addition, subtraction, multiplication and division on two numbers.

Calculator Program using Java Swing

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//Calculator using Swing

import java.awt.event.*;

import javax.swing.*;

public class Calculator extends JFrame implements ActionListener

{

//Declare the variables

JLabel label1, label2, labelResult;

JTextField text1, text2, textResult;

JButton buttonAdd, buttonSub, buttonMul, buttonDiv;

public Calculator(){

//Create the frame

JFrame frame = new JFrame("Calculator");

frame.setLayout(null);

frame.setSize(300,250);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//Create the labels

label1 = new JLabel("Number 1");

label1.setBounds(20,20,100,20);

frame.add(label1);

label2 = new JLabel("Number 2");

label2.setBounds(20,50,100,20);

frame.add(label2);

labelResult = new JLabel("Result");

labelResult.setBounds(20,80,100,20);

frame.add(labelResult);

//Create the text fields

text1 = new JTextField();

text1.setBounds(140,20,100,20);

frame.add(text1);

text2 = new JTextField();

text2.setBounds(140,50,100,20);

frame.add(text2);

textResult = new JTextField();

textResult.setBounds(140,80,100,20);

frame.add(textResult);

//Create the buttons

buttonAdd = new JButton("+");

buttonAdd.setBounds(20,120,50,20);

frame.add(buttonAdd);

buttonAdd.addActionListener(this);

buttonSub = new JButton("-");

buttonSub.setBounds(80,120,50,20);

frame.add(buttonSub);

buttonSub.addActionListener(this);

buttonMul = new JButton("*");

buttonMul.setBounds(140,120,50,20);

frame.add(buttonMul);

buttonMul.addActionListener(this);

buttonDiv = new JButton("/");

buttonDiv.setBounds(200,120,50,20);

frame.add(buttonDiv);

buttonDiv.addActionListener(this);

//Make the frame visible

frame.setVisible(true);

}

public void actionPerformed(ActionEvent e){

if(e.getSource() == buttonAdd){

int num1 = Integer.parseInt(text1.getText());

int num2 = Integer.parseInt(text2.getText());

int result = num1 + num2;

textResult.setText(String.valueOf(result));

}

else if(e.getSource() == buttonSub){

int num1 = Integer.parseInt(text1.getText());

int num2 = Integer.parseInt(text2.getText());

int result = num1 - num2;

textResult.setText(String.valueOf(result));

}

else if(e.getSource() == buttonMul){

int num1 = Integer.parseInt(text1.getText());

int num2 = Integer.parseInt(text2.getText());

int result = num1 * num2;

textResult.setText(String.valueOf(result));

}

else if(e.getSource() == buttonDiv){

int num1 = Integer.parseInt(text1.getText());

int num2 = Integer.parseInt(text2.getText());

int result = num1 / num2;

textResult.setText(String.valueOf(result));

}

public static void main(String[] args) {

Calculator calculator = new Calculator();

}

Output

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Simple Calculator Program using Java Swing

Calculator Program using Java Swing