Write a Program to create calculator using Java Swing

Swing Program

  
         
public class SwingCalc extends javax.swing.JFrame {

    public SwingCalc() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        inputTxt1 = new javax.swing.JTextField();
        inputTxt2 = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        outputTxt = new javax.swing.JTextField();
        sumbt = new javax.swing.JButton();
        subbt = new javax.swing.JButton();
        mulbt = new javax.swing.JButton();
        divbt = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("Input Value 1");

        jLabel2.setText("Input Value 2");

        inputTxt1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                inputTxt1ActionPerformed(evt);
            }
        });

        jLabel3.setText("Output Value");

        sumbt.setText("SUM");
        sumbt.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                sumbtActionPerformed(evt);
            }
        });

        subbt.setText("SUB");
        subbt.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                subbtActionPerformed(evt);
            }
        });

        mulbt.setText("MUL");
        mulbt.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                mulbtActionPerformed(evt);
            }
        });

        divbt.setText("DIV");
        divbt.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                divbtActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(70, 70, 70)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel1)
                            .addComponent(jLabel2)
                            .addComponent(jLabel3))
                        .addGap(55, 55, 55)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(inputTxt1, javax.swing.GroupLayout.DEFAULT_SIZE, 100, Short.MAX_VALUE)
                            .addComponent(inputTxt2)
                            .addComponent(outputTxt)))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(29, 29, 29)
                        .addComponent(sumbt, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(subbt, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(mulbt, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(divbt, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(37, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(48, 48, 48)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(inputTxt1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(29, 29, 29)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(inputTxt2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(28, 28, 28)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(outputTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(49, 49, 49)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(sumbt)
                    .addComponent(subbt)
                    .addComponent(mulbt)
                    .addComponent(divbt))
                .addContainerGap(63, Short.MAX_VALUE))
        );

        pack();
    }
    private void sumbtActionPerformed(java.awt.event.ActionEvent evt) {                                      
        int val1 = Integer.parseInt(inputTxt1.getText());
        int val2 = Integer.parseInt(inputTxt2.getText());
        int val3 = val1 + val2;
        outputTxt.setText(Integer.toString(val3));
    }                                     

    private void subbtActionPerformed(java.awt.event.ActionEvent evt) {                                      
        int val1 = Integer.parseInt(inputTxt1.getText());
        int val2 = Integer.parseInt(inputTxt2.getText());
        int val3 = val1 - val2;
        outputTxt.setText(Integer.toString(val3));
    }                                     

    private void mulbtActionPerformed(java.awt.event.ActionEvent evt) {                                      
        int val1 = Integer.parseInt(inputTxt1.getText());
        int val2 = Integer.parseInt(inputTxt2.getText());
        int val3 = val1 * val2;
        outputTxt.setText(Integer.toString(val3));
    }                                     

    private void divbtActionPerformed(java.awt.event.ActionEvent evt) {                                      
        int val1 = Integer.parseInt(inputTxt1.getText());
        int val2 = Integer.parseInt(inputTxt2.getText());
        int val3 = val1 / val2;
        outputTxt.setText(Integer.toString(val3));
    }                                     

    public static void main(String args[]) {

        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new SwingCalc().setVisible(true);
            }
        });
    }
                  
    private javax.swing.JButton divbt;
    private javax.swing.JTextField inputTxt1;
    private javax.swing.JTextField inputTxt2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JButton mulbt;
    private javax.swing.JTextField outputTxt;
    private javax.swing.JButton subbt;
    private javax.swing.JButton sumbt;          
}

  
  

Output