Java™ How To Program (Early Objects), Tenth Edition

Setting Up the Format Menu

Lines 78–79 create the formatMenu and set its mnemonic to r. F is not used because that’s the File menu’s mnemonic. Lines 84–85 create colorMenu (this will be a submenu in Format) and set its mnemonic to C. Line 88 creates JRadioButtonMenuItem array colorItems, which refers to the menu items in colorMenu. Line 89 creates ButtonGroup colorButtonGroup, which ensures that only one of the Color submenu items is selected at a time. Line 90 creates an instance of inner class ItemHandler (declared at lines 154–181) that responds to selections from the Color and Font submenus (discussed shortly). The loop at lines 93–100 creates each JRadioButtonMenuItem in array colorItems, adds each menu item to colorMenu and to colorButtonGroup ...