simple calculator using java code

in my OOP class , mrs tita karlita teaching about make the simple calculator using java code .

public class hitung extends javax.swing.JFrame {
    public hitung() {
        initComponents();
    }

    @SuppressWarnings("unchecked")


    private void kurangActionPerformed(java.awt.event.ActionEvent evt) {
    }

    private void bagiActionPerformed(java.awt.event.ActionEvent evt) {
    }

    private void tambahActionPerformed(java.awt.event.ActionEvent evt) {
    }



private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        double a , b ,hsil ;
        a = Double.parseDouble(angka1.getText());
        b = Double.parseDouble(angka2.getText());
       
        if(tambah.isSelected() == true){
            hsil = a + b;
            hasil.setText(""+ hsil);
        }
        else if(kurang.isSelected() == true){
            hsil = a - b;
            hasil.setText(""+ hsil);
        }
        else if(kali.isSelected() == true){
            hsil = a * b;
            hasil.setText(""+ hsil);
        }
        else if(bagi.isSelected() == true){
            hsil = a / b;
            hasil.setText(""+ hsil);
        }
    }

   private void angka2ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }
  public static void main(String args[]) {
       
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new hitung().setVisible(true);
            }
        });
    }




    private javax.swing.JTextField angka1;
    private javax.swing.JTextField angka2;
    private javax.swing.JRadioButton bagi;
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.JLabel hasil;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JRadioButton jRadioButton3;
    private javax.swing.JRadioButton kali;
    private javax.swing.JRadioButton kurang;
    private javax.swing.JRadioButton tambah;
}

and this output like this

thanks for reading guys , i hope this program have many advantages for us :)

Adita Saraswati - 7411030055