Java MenuBar

public class MyForm extends JFrame {

    public MyForm() {

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setBounds(100, 100, 362, 249);

        setTitle("Kittisay Java");

        setLayout(null);

        // Menu Bar

        JMenuBar menuBar = new JMenuBar();

        // Menu 1

        JMenu menu1 = new JMenu("Menu 1");

        JMenuItem menu1_1 = new JMenuItem("Sub Menu 1-1");

        JMenuItem menu1_2 = new JMenuItem("Sub Menu 1-2");

        menu1.add(menu1_1);

        menu1.add(menu1_2);

        menuBar.add(menu1);

        // Menu 2

        JMenu menu2 = new JMenu("Menu 2");

        JMenuItem menu2_1 = new JMenuItem("Sub Menu 2-1");

        JMenuItem menu2_2 = new JMenuItem("Sub Menu 2-2");

        menu2.add(menu2_1);

        menu2.add(menu2_2);

        menuBar.add(menu2);

        setJMenuBar(menuBar);

    }

    public static void main(String[] args) {

      MyForm frm = new MyForm();

      frm.setVisible(true);

    }

public class MyForm extends JFrame {

    public MyForm() {

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setBounds(100, 100, 362, 249);

        setTitle("Kitttisay Java");

        getContentPane().setLayout(null);

        // Menu Bar

        JMenuBar menuBar = new JMenuBar();

        JMenu menu = new JMenu("File");

        menu.setMnemonic(KeyEvent.VK_F);

        // Open

        JMenuItem menuOpen = new JMenuItem("Open");

        menuOpen.setMnemonic(KeyEvent.VK_O);

        menuOpen.setToolTipText("Open Application");

        menuOpen.addActionListener((ActionEvent event) -> {

        });

        // Exit

        JMenuItem menuExit = new JMenuItem("Exit");

        menuExit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E,

                ActionEvent.CTRL_MASK));

        menuExit.setToolTipText("Exit Application");

        menuExit.addActionListener((ActionEvent event) -> {

            System.exit(0);

        });

        // Create menu

        menu.add(menuOpen);

        menu.addSeparator();

        menu.add(menuExit);

        menuBar.add(menu);

        setJMenuBar(menuBar);

    }

    public static void main(String[] args) {

      MyForm frm = new MyForm();

      frm.setVisible(true);

    }