Java Check Box

public class MyForm extends JFrame {

    public MyForm() {

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setBounds(100, 100, 362, 249);

        setTitle("Kittisay Java");

        setLayout(null);

        // Checkbox 1

        JCheckBox chkBox1 = new JCheckBox("Checkbox 1");

        chkBox1.setBounds(106, 65, 97, 23);

        add(chkBox1);

        // Button

        JButton btn = new JButton("Button");

        btn.addActionListener((e) -> {

            if (chkBox1.isSelected()) {

                JOptionPane.showMessageDialog(null,"Checkbox 1 is Checked");

            } else {

                JOptionPane.showMessageDialog(null,"Checkbox 1 is UnChecked");

            }

        });

        btn.setBounds(140, 141, 89, 23);

        add(btn);    

    }

    public static void main(String[] args) {

      MyForm frm = new MyForm();

      frm.setVisible(true);

    }