Java Menu Item/Checkbox (JCheckBoxMenuItem) - Swing Example

JMenu menu = new JMenu("File");
JCheckBoxMenuItem chkMenu = new JCheckBoxMenuItem("CheckBox Item");
menu.add(chkMenu); 

package com.java.myapp;

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.KeyStroke;

public class MyForm extends JFrame {

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				MyForm frame = new MyForm();
				frame.setVisible(true);
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MyForm() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 362, 249);
		setTitle("ThaiCreate.Com Java GUI Tutorial");
		getContentPane().setLayout(null);
		
		// Menu Bar
        JMenuBar menuBar=new JMenuBar();
        
        JMenu menu = new JMenu("File");
        menu.setMnemonic(KeyEvent.VK_F);
        
        // Open
        ImageIcon openExit = new ImageIcon(getClass().getResource("open.gif"));
        JMenuItem menuOpen = new JMenuItem("Open",openExit);
        menuOpen.setMnemonic(KeyEvent.VK_O);
        menuOpen.setToolTipText("Open Application");
        menuOpen.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
            	JOptionPane.showMessageDialog(null,
            			"Open Command");
            }
        });
        
        // CheckBox
        final JCheckBoxMenuItem chkMenu = new JCheckBoxMenuItem("CheckBox Item");
        chkMenu.setState(false);
        chkMenu.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
              if (chkMenu.isVisible()) {
            	  JOptionPane.showMessageDialog(null,
              			"Checkbox is Checked");
              } else {
            	  JOptionPane.showMessageDialog(null,
              			"Checkbox is UnChecked");
              }
            }

        });
        
        // Exit
        ImageIcon iconExit = new ImageIcon(getClass().getResource("exit.gif"));
        JMenuItem menuExit = new JMenuItem("Exit",iconExit);
        menuExit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E,
        	    ActionEvent.CTRL_MASK));
        menuExit.setToolTipText("Exit Application");
        menuExit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
            	System.exit(0);
            }
        });
        
        // Create menu
        menu.add(menuOpen); // Open
        menu.addSeparator();
        menu.add(chkMenu);  // Checkbox
        menu.addSeparator();
        menu.add(menuExit); // Exit
       
        menuBar.add(menu);


        setJMenuBar(menuBar);
	}
}