Swing Menus and Toolbars - The Definitive Guide to Java Swing - page 167

Table 6-5. JMenu Properties (Continued)

Property Name Data Type Access

menuListeners MenuListener[ ] Read-only

model ButtonModel Write-only bound

popupMenu JPopupMenu Read-only

popupMenuVisible boolean Read-write

selected boolean Read-write

subElements MenuElement[ ]

Read-only

tearOff boolean Read-only

topLevelMenu boolean Read-only

UIClassID String

Read-only

■ Tip Keep in mind that many property methods are inherited and that the parent class might offer a getter

method where the current class defines only a new setter method, or vice versa.

The delay property represents the value for the time that elapses between selection
of a JMenu and posting of the JPopupMenu . By default, this value is zero, meaning that the
submenu will appear immediately. Trying to set the value to a negative setting will throw
an IllegalArgumentException .

■ Caution Since there is no support for tear-off menus, if you try to access the tearOff property, an error
will be thrown.

Selecting Menu Components
Normally, you don't need to listen for the selection of JMenu components. You listen for only
selection of individual JMenuItem components. Nevertheless, you may be interested in the
different ways that ChangeEvent works with a JMenu as compared with a JMenuItem . In addition,
a MenuEvent can notify you whenever a menu is posted or canceled.