package com.tutorialspoint.gui;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class SwingMenuDemo
{
		private JFrame mainFrame;
		private JLabel headerLabel;
		private JLabel statusLabel;
		private JPanel controlPanel;

		public SwingMenuDemo()
		{
				prepareGUI();
		}
		public static void main(String[] args)
		{
				SwingMenuDemo swingMenuDemo = new SwingMenuDemo();
				swingMenuDemo.showMenuDemo();
		}
		private void prepareGUI()
		{
				mainFrame = new JFrame("Java SWING Examples");
				mainFrame.setSize(400,400);
				mainFrame.setLayout(new GridLayout(3, 1));
				headerLabel = new JLabel("",JLabel.CENTER );
				statusLabel = new JLabel("",JLabel.CENTER);
				statusLabel.setSize(350,100);
				mainFrame.addWindowListener(new WindowAdapter() 
				{
						public void windowClosing(WindowEvent windowEvent)
						{
								System.exit(0);
						}
				});
				controlPanel = new JPanel();
				controlPanel.setLayout(new FlowLayout());
				mainFrame.add(headerLabel);
				mainFrame.add(controlPanel);
				mainFrame.add(statusLabel);
				mainFrame.setVisible(true);
		}
		private void showMenuDemo()
		{
				//create a menu bar
				final JMenuBar menuBar = new JMenuBar();
				//create menus
				JMenu fileMenu = new JMenu("File");
				JMenu editMenu = new JMenu("Edit");
				final JMenu aboutMenu = new JMenu("About");
				final JMenu linkMenu = new JMenu("Links");
				//create menu items
				JMenuItem newMenuItem = new JMenuItem("New");
				newMenuItem.setMnemonic(KeyEvent.VK_N);
				newMenuItem.setActionCommand("New");
				JMenuItem openMenuItem = new JMenuItem("Open");
				openMenuItem.setActionCommand("Open");
				JMenuItem saveMenuItem = new JMenuItem("Save");
				saveMenuItem.setActionCommand("Save");
				JMenuItem exitMenuItem = new JMenuItem("Exit");
				exitMenuItem.setActionCommand("Exit");
				JMenuItem cutMenuItem = new JMenuItem("Cut");
				cutMenuItem.setActionCommand("Cut");
				JMenuItem copyMenuItem = new JMenuItem("Copy");
				copyMenuItem.setActionCommand("Copy");
				JMenuItem pasteMenuItem = new JMenuItem("Paste");
				pasteMenuItem.setActionCommand("Paste");
				MenuItemListener menuItemListener = new MenuItemListener();
				newMenuItem.addActionListener(menuItemListener);
				openMenuItem.addActionListener(menuItemListener);
				saveMenuItem.addActionListener(menuItemListener);
				exitMenuItem.addActionListener(menuItemListener);
				cutMenuItem.addActionListener(menuItemListener);
				copyMenuItem.addActionListener(menuItemListener);
				pasteMenuItem.addActionListener(menuItemListener);
				final JCheckBoxMenuItem showWindowMenu = new JCheckBoxMenuItem("Show About", true);
				showWindowMenu.addItemListener(new ItemListener() 
				{
						public void itemStateChanged(ItemEvent e) 
						{
								if(showWindowMenu.getState())
								{
										menuBar.add(aboutMenu);
								} 
								else 
								{
										menuBar.remove(aboutMenu);
								}
						}
				});
				final JRadioButtonMenuItem showLinksMenu = new JRadioButtonMenuItem("Show Links", true);
				showLinksMenu.addItemListener(new ItemListener() 
				{
						public void itemStateChanged(ItemEvent e) 
						{
								if(menuBar.getMenu(3)!= null)
								{
										menuBar.remove(linkMenu);
										mainFrame.repaint();
								} 
								else 
								{
										menuBar.add(linkMenu);
										mainFrame.repaint();
								}
						}
				});
//add menu items to menus
fileMenu.add(newMenuItem);
fileMenu.add(openMenuItem);
fileMenu.add(saveMenuItem);
fileMenu.addSeparator();
fileMenu.add(showWindowMenu);
fileMenu.addSeparator();
fileMenu.add(showLinksMenu);
fileMenu.addSeparator();
fileMenu.add(exitMenuItem);
editMenu.add(cutMenuItem);
editMenu.add(copyMenuItem);
editMenu.add(pasteMenuItem);
//add menu to menubar
menuBar.add(fileMenu);
menuBar.add(editMenu);
menuBar.add(aboutMenu);
menuBar.add(linkMenu);
//add menubar to the frame
mainFrame.setJMenuBar(menuBar);
mainFrame.setVisible(true);
}
class MenuItemListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
statusLabel.setText(e.getActionCommand() + " JMenuItem clicked.");
}
}
}