FileDocCategorySizeDatePackage
MenuDemo.javaAPI DocExample2803Sat Nov 25 12:55:16 GMT 2000None

MenuDemo

public class MenuDemo extends Frame implements ActionListener, ItemListener
Demonstrate Menus and the MenuBar class/MenuContainer interface This version uses 1.1 action handling and MenuShortcut. The action handling is incomplete; realistically, each MenuItem would have its own, task-specific ActionListener; this would handle the MenuShortcuts and the CheckboxMenuItems correctly.
author
Ian Darwin

Fields Summary
MenuBar
mb
Menu
fm
File, Options, Help
Menu
om
Menu
hm
Menu
opSubm
Options Sub-Menu
MenuItem
exitItem
The MenuItem for exiting.
CheckboxMenuItem
cb
An option that can be on or off.
Constructors Summary
MenuDemo(String s)

		super("MenuDemo: " + s);

		Container cp = this;
		cp.setLayout(new FlowLayout());

		mb = new MenuBar();
		setMenuBar(mb);		// Frame implements MenuContainer

		MenuItem mi;
		// The File Menu...
		fm = new Menu("File");
			fm.add(mi = new MenuItem("Open", new MenuShortcut('O")));
			mi.addActionListener(this);
			fm.add(mi = new MenuItem("Close", new MenuShortcut('W")));
			mi.addActionListener(this);
			fm.addSeparator();
			fm.add(mi = new MenuItem("Print", new MenuShortcut('P")));
			mi.addActionListener(this);
			fm.addSeparator();
			fm.add(mi = new MenuItem("Exit", new MenuShortcut('Q")));
			exitItem = mi;			// save for action handler
			mi.addActionListener(this);
		mb.add(fm);

		// The Options Menu...
		om = new Menu("Options");
			cb = new CheckboxMenuItem("AutoSave");
			cb.setState(true);
			cb.addItemListener(this);
			om.add(cb);
			opSubm = new Menu("SubOptions");
			opSubm.add(new MenuItem("Alpha"));
			opSubm.add(new MenuItem("Gamma"));
			opSubm.add(new MenuItem("Delta"));
			om.add(opSubm);
		mb.add(om);

		// The Help Menu...
		hm = new Menu("Help");
			hm.add(mi = new MenuItem("About"));
			mi.addActionListener(this);
			hm.add(mi = new MenuItem("Topics"));
			mi.addActionListener(this);
		mb.add(hm);
		mb.setHelpMenu(hm);		// needed for portability (Motif, etc.).

		// the main window
		cp.add(new MyLabel("Menu Demo Window", 200, 150));
		pack();
Methods Summary
public voidactionPerformed(java.awt.event.ActionEvent evt)
Handle action events.

		// System.out.println("Event " + evt);
		String cmd;
		if ((cmd = evt.getActionCommand()) == null)
			System.out.println("You chose a menu shortcut");
		else
			System.out.println("You chose " + cmd);
		Object cmp = evt.getSource();
		// System.out.println("Source " + cmp);
		if (cmp == exitItem)
			System.exit(0);
public voiditemStateChanged(java.awt.event.ItemEvent e)
The CheckBoxMenuItems send a different message

		System.out.println("AutoSave is set " + cb.getState());
public static voidmain(java.lang.String[] arg)

		new MenuDemo("Testing 1 2 3...").setVisible(true);