A menu item can receive notification of selection changes by overriding its menuSelectionChanged() method. See also e808 建立菜单栏，菜单，菜单项.

    JMenuItem item = new JMenuItem("Label") {

        // This method is called whenever the selection status of

        // this menu item is changed

        public void menuSelectionChanged(boolean isSelected) {

            // Always forward the event

            super.menuSelectionChanged(isSelected);

            if (isSelected) {

                // The menu item is selected

            } else {

                // The menu item is no longer selected

            }

        }

    };