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Chapter 19 java.awt Reference |
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MenuBar
Name
MenuBar
![[Graphic: Figure from the text]](./figs/menuba2.gif)
Description
A MenuBar holds menus. MenuBars are always attached to frames, and displayed on the top line of the Frame. One menu in a MenuBar may be designated a "help" menu.
Class Definition
public class java.awt.MenuBar
extends java.awt.MenuComponent
implements java.awt.MenuContainer {
// Constructors
public MenuBar();
// Instance Methods
public synchronized Menu add (Menu m);
public void addNotify();
public int countMenus(); 
public void deleteShortcut (MenuShortcut s); 
public Menu getHelpMenu();
public Menu getMenu (int index);
public int getMenuCount();
public MenuItem getShortcutMenuItem (MenuShortcut s);
public synchronized void remove (int index);
public synchronized void remove (MenuComponent component);
public void removeNotify();
public synchronized void setHelpMenu (Menu m);
public synchronized Enumeration shortcuts();
}
Constructors
MenuBar
public MenuBar()
- Description
-
Constructs a MenuBar object.
Instance Methods
add
public synchronized Menu add (Menu m)
- Parameters
-
- m
-
A Menu to add to MenuBar.
- m
- Returns
-
Item just added.
- Description
-
Adds a new menu to the MenuBar.
addNotify
public void addNotify()
- Description
-
Creates MenuBar's peer and peers of contained menus.
countMenus
public int countMenus()
- Returns
-
The number of menus on the menu bar. Replaced by getMenuCount().
deleteShortcut
public void deleteShortcut (MenuShortcut s)
- Parameters
-
- s
-
The shortcut to remove.
- s
- Description
-
Removes a menu shortcut.
getHelpMenu
public Menu getHelpMenu()
- Returns
-
The menu that was designated the help menu.
getMenu
public Menu getMenu (int index)
- Parameters
-
- index
-
The position of the Menu to fetch.
- index
- Returns
-
The Menu at the designated position.
getMenuCount
public int getMenuCount()
- Returns
-
The number of menus on the menu bar.
getShortcutMenuItem
public MenuItem getShortcutMenuItem (MenuShortcut s)
- Parameters
-
- s
-
A menu shortcut.
- s
- Returns
-
The corresponding menu item.
- Description
-
Finds the MenuItem corresponding to the given MenuShortcut, or null if no match is found.
remove
public synchronized void remove (int index)
- Parameters
-
- index
-
The position of the Menu to remove.
- index
- Description
-
Removes a Menu from the MenuBar.
public synchronized void remove (MenuComponent component)
- Parameters
-
- component
-
The element of the MenuBar to remove.
- component
- Implements
-
MenuContainer.remove()
- Description
-
Removes a Menu from the MenuBar.
removeNotify
public void removeNotify()
- Description
-
Destroys the MenuBar peer, and peers for all Menu objects that appear on it.
setHelpMenu
public synchronized void setHelpMenu (Menu m)
- Parameters
-
- m
-
Menu to designate as the help menu.
- m
- Description
-
Designates a Menu as the MenuBar's help menu.
shortcuts
public synchronized Enumeration shortcuts()
- Returns
-
An Enumeration of MenuShortcut objects.
- Description
-
Returns an Enumeration of all MenuShortcut objects managed by this MenuBar.
See Also
Frame, Menu, MenuComponent, MenuContainer
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MenuComponent |
