import java.awt.*;import java.awt.event.*;import javax.swing.JMenu;import javax.swing.JMenuItem;import javax.swing.JCheckBoxMenuItem;import javax.swing.JRadioButtonMenuItem;import javax.swing.ButtonGroup;import javax.swing.JMenuBar;import javax.swing.KeyStroke;import javax.swing.ImageIcon;import javax.swing.JPanel;import javax.swing.JTextArea;import javax.swing.JScrollPane;import javax.swing.JFrame;/* MenuLookDemo.java is a 1.4 application that requires images/middle.gif. *//* * This class exists solely to show you what menus look like. * It has no menu-related event handling. */public class MenuLookDemo {    JTextArea output;    JScrollPane scrollPane;    public JMenuBar createMenuBar() {        JMenuBar menuBar;        JMenu menu, submenu;        JMenuItem menuItem;        JRadioButtonMenuItem rbMenuItem;        JCheckBoxMenuItem cbMenuItem;        //Create the menu bar.        menuBar = new JMenuBar();        //Build the first menu.        menu = new JMenu("A Menu");        menu.setMnemonic(KeyEvent.VK_A);        menu.getAccessibleContext().setAccessibleDescription(                "The only menu in this program that has menu items");        menuBar.add(menu);        //a group of JMenuItems        menuItem = new JMenuItem("A text-only menu item",                                 KeyEvent.VK_T);        //menuItem.setMnemonic(KeyEvent.VK_T); //used constructor instead        menuItem.setAccelerator(KeyStroke.getKeyStroke(                KeyEvent.VK_1, ActionEvent.ALT_MASK));        menuItem.getAccessibleContext().setAccessibleDescription(                "This doesn't really do anything");        menu.add(menuItem);        ImageIcon icon = createImageIcon("images/middle.gif");        menuItem = new JMenuItem("Both text and icon", icon);        menuItem.setMnemonic(KeyEvent.VK_B);        menu.add(menuItem);        menuItem = new JMenuItem(icon);        menuItem.setMnemonic(KeyEvent.VK_D);        menu.add(menuItem);        //a group of radio button menu items        menu.addSeparator();        ButtonGroup group = new ButtonGroup();        rbMenuItem = new JRadioButtonMenuItem("A radio button menu item");        rbMenuItem.setSelected(true);        rbMenuItem.setMnemonic(KeyEvent.VK_R);        group.add(rbMenuItem);        menu.add(rbMenuItem);        rbMenuItem = new JRadioButtonMenuItem("Another one");        rbMenuItem.setMnemonic(KeyEvent.VK_O);        group.add(rbMenuItem);        menu.add(rbMenuItem);        //a group of check box menu items        menu.addSeparator();        cbMenuItem = new JCheckBoxMenuItem("A check box menu item");        cbMenuItem.setMnemonic(KeyEvent.VK_C);        menu.add(cbMenuItem);        cbMenuItem = new JCheckBoxMenuItem("Another one");        cbMenuItem.setMnemonic(KeyEvent.VK_H);        menu.add(cbMenuItem);        //a submenu        menu.addSeparator();        submenu = new JMenu("A submenu");        submenu.setMnemonic(KeyEvent.VK_S);        menuItem = new JMenuItem("An item in the submenu");        menuItem.setAccelerator(KeyStroke.getKeyStroke(                KeyEvent.VK_2, ActionEvent.ALT_MASK));        submenu.add(menuItem);        menuItem = new JMenuItem("Another item");        submenu.add(menuItem);        menu.add(submenu);        //Build second menu in the menu bar.        menu = new JMenu("Another Menu");        menu.setMnemonic(KeyEvent.VK_N);        menu.getAccessibleContext().setAccessibleDescription(                "This menu does nothing");        menuBar.add(menu);        return menuBar;    }    public Container createContentPane() {        //Create the content-pane-to-be.        JPanel contentPane = new JPanel(new BorderLayout());        contentPane.setOpaque(true);        //Create a scrolled text area.        output = new JTextArea(5, 30);        output.setEditable(false);        scrollPane = new JScrollPane(output);        //Add the text area to the content pane.        contentPane.add(scrollPane, BorderLayout.CENTER);        return contentPane;    }    /** Returns an ImageIcon, or null if the path was invalid. */    protected static ImageIcon createImageIcon(String path) {        java.net.URL imgURL = MenuLookDemo.class.getResource(path);        if (imgURL != null) {            return new ImageIcon(imgURL);        } else {            System.err.println("Couldn't find file: " + path);            return null;        }    }    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Make sure we have nice window decorations.        JFrame.setDefaultLookAndFeelDecorated(true);        //Create and set up the window.        JFrame frame = new JFrame("MenuLookDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Create and set up the content pane.        MenuLookDemo demo = new MenuLookDemo();        frame.setJMenuBar(demo.createMenuBar());        frame.setContentPane(demo.createContentPane());        //Display the window.        frame.setSize(450, 260);        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event-dispatching thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }}