Java java.awt Class MenuBar（JDK8）

Constructor Detail

• MenuBar

  public MenuBar()
          throws HeadlessException

  Creates a new menu bar.

  Throws:

  HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

  See Also:

  GraphicsEnvironment.isHeadless()

Method Detail

• 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 specified menu to be this menu bar's help menu. If this menu bar has an existing help menu, the old help menu is removed from the menu bar, and replaced with 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. If the menu has been part of another menu bar, removes it from that menu bar.

  Parameters:

  m - the menu to be added

  Returns:

  the menu added

  See Also:

  remove(int), remove(java.awt.MenuComponent)

• 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(java.awt.Menu)

• remove

  public void remove(MenuComponent m)

  Removes the specified menu component from this menu bar.

  Specified by:

  remove in interface MenuContainer

  Parameters:

  m - the menu component to be removed.

  See Also:

  add(java.awt.Menu)

• getMenuCount

  public int getMenuCount()

  Gets the number of menus on the menu bar.

  Returns:

  the number of menus on the menu bar.

  Since:

  JDK1.1

• countMenus

  @Deprecated
  public int countMenus()

  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 Enumeration<MenuShortcut> 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.

  Since:

  JDK1.1

  See Also:

  MenuShortcut

• getShortcutMenuItem

  public MenuItem getShortcutMenuItem(MenuShortcut s)

  Gets the instance of MenuItem associated with the specified MenuShortcut object, or null if none of the menu items being managed by this menu bar is associated with the specified menu shortcut.

  Parameters:

  s - the specified menu shortcut.

  Since:

  JDK1.1

  See Also:

  MenuItem, MenuShortcut

• deleteShortcut

  public void deleteShortcut(MenuShortcut s)

  Deletes the specified menu shortcut.

  Parameters:

  s - the menu shortcut to delete.

  Since:

  JDK1.1

• getAccessibleContext

  public AccessibleContext getAccessibleContext()

  Gets the AccessibleContext associated with this MenuBar. For menu bars, the AccessibleContext takes the form of an AccessibleAWTMenuBar. A new AccessibleAWTMenuBar instance is created if necessary.

  Specified by:

  getAccessibleContext in interface Accessible

  Overrides:

  getAccessibleContext in class MenuComponent

  Returns:

  an AccessibleAWTMenuBar that serves as the AccessibleContext of this MenuBar

  Since:

  1.3