Section 22.4 Using Menus with Frames
• Menus neatly organize commands in a GUI. In Swing GUIs, menus can be attached only to objects of classes with method setJMenuBar (p. 917).
• A JMenuBar (p. 917) is a container for menus. A JMenuItem appears in a menu. A JMenu (p. 917) contains menu items and can be added to a JMenuBar or to other JMenus as submenus.
• When a menu is clicked, it expands to show its list of menu items.
• When a JCheckBoxMenuItem (p. 918) is selected, a check appears to the left of the menu item. When the JCheckBoxMenuItem is selected again, the check is removed.
• In a ButtonGroup, only one JRadioButtonMenuItem (p. 918) can be selected at a time.
• AbstractButton method setMnemonic (p. 923) specifies the mnemonic (p. 918 ...
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