Class java.awt.MenuBar - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.awt.MenuBar

java.lang.Object
   |
   +----java.awt.MenuComponent
           |
           +----java.awt.MenuBar

public class MenuBar
extends MenuComponent
implements MenuContainer

The MenuBar class encapsulates the platform's concept of a menu bar bound to a frame. In order to associate the menu bar with a Frame object, call the frame's setMenuBar method.

This is what a menu bar might look like:

A menu bar handles keyboard shortcuts for menu items, passing them along to its child menus. (Keyboard shortcuts, which are optional, provide the user with an alternative to the mouse for invoking a menu item and the action that is associated with it.) Each menu item can maintain an instance of MenuShortcut. The MenuBar class defines several methods, shortCuts and getShortcutMenuItem that retrieve information about the shortcuts a given menu bar is managing.

See Also:: Frame, setMenuBar, Menu, MenuItem, MenuShortcut

MenuBar(): Creates a new menu bar.

add(Menu): Adds the specified menu to the menu bar.
addNotify(): Creates the menu bar's peer.
countMenus(): Deprecated.
deleteShortcut(MenuShortcut): Deletes the specified menu shortcut.
getHelpMenu(): Gets the help menu on the menu bar.
getMenu(int): Gets the specified menu.
getMenuCount(): Gets the number of menus on the menu bar.
getShortcutMenuItem(MenuShortcut): Gets the instance of MenuItem associated with the specified MenuShortcut object, or null if none has been specified.
remove(int): Removes the menu located at the specified index from this menu bar.
remove(MenuComponent): Removes the specified menu component from this menu bar.
removeNotify(): Removes the menu bar's peer.
setHelpMenu(Menu): Sets the help menu on this menu bar to be the specified menu.
shortcuts(): Gets an enumeration of all menu shortcuts this menu bar is managing.

MenuBar

 public MenuBar()

Creates a new menu bar.

addNotify

 public void addNotify()

Creates the menu bar's peer. The peer allows us to change the appearance of the menu bar without changing any of the menu bar's functionality.

removeNotify

 public void removeNotify()

Removes the menu bar's peer. The peer allows us to change the appearance of the menu bar without changing any of the menu bar's functionality.

Overrides:: removeNotify in class MenuComponent

getHelpMenu

 public Menu getHelpMenu()

Gets the help menu on the menu bar.

Returns:: the help menu on this menu bar.

setHelpMenu

 public void setHelpMenu(Menu m)

Sets the help menu on this menu bar to be the specified menu.

Parameters:: m - the menu to be set as the help menu.

add

 public Menu add(Menu m)

Adds the specified menu to the menu bar.

Parameters:: m - the menu to be added.
Returns:: the menu added.
See Also:: remove, remove

remove

 public void remove(int index)

Removes the menu located at the specified index from this menu bar.

Parameters:: index - the position of the menu to be removed.
See Also:: add

remove

 public void remove(MenuComponent m)

Removes the specified menu component from this menu bar.

Parameters:: m - the menu component to be removed.
See Also:: add

getMenuCount

 public int getMenuCount()

Gets the number of menus on the menu bar.

Returns:: the number of menus on the menu bar.

countMenus

 public int countMenus()

Note: countMenus() is deprecated. As of JDK version 1.1, replaced by getMenuCount().

getMenu

 public Menu getMenu(int i)

Gets the specified menu.

Parameters:: i - the index position of the menu to be returned.
Returns:: the menu at the specified index of this menu bar.

shortcuts

 public synchronized Enumeration shortcuts()

Gets an enumeration of all menu shortcuts this menu bar is managing.

Returns:: an enumeration of menu shortcuts that this menu bar is managing.
See Also:: MenuShortcut

getShortcutMenuItem

 public MenuItem getShortcutMenuItem(MenuShortcut s)

Gets the instance of MenuItem associated with the specified MenuShortcut object, or null if none has been specified.

Parameters:: s - the specified menu shortcut.
See Also:: MenuItem, MenuShortcut

deleteShortcut

 public void deleteShortcut(MenuShortcut s)

Deletes the specified menu shortcut.

Parameters:: s - the menu shortcut to delete.

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