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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/Menu.html below:

Menu (Java SE 19 & JDK 19)

All Implemented Interfaces:

MenuContainer, Serializable, Accessible

Direct Known Subclasses:

PopupMenu

A

object is a pull-down menu component that is deployed from a menu bar.

A menu can optionally be a tear-off menu. A tear-off menu can be opened and dragged away from its parent menu bar or menu. It remains on the screen after the mouse button has been released. The mechanism for tearing off a menu is platform dependent, since the look and feel of the tear-off menu is determined by its peer. On platforms that do not support tear-off menus, the tear-off property is ignored.

Each item in a menu must belong to the MenuItem class. It can be an instance of MenuItem, a submenu (an instance of Menu), or a check box (an instance of CheckboxMenuItem).

Since:

1.0

See Also:

• MenuItem
• CheckboxMenuItem
• Serialized Form

• Nested Class Summary

  Nested Classes

  protected class 

  Inner class of Menu used to provide default support for accessibility.

• Constructor Summary

  Constructors

  Constructs a new menu with an empty label.

  Constructs a new menu with the specified label.

  Constructs a new menu with the specified label, indicating whether the menu can be torn off.

• Method Summary

  Adds the specified menu item to this menu.

  void

  Adds an item with the specified label to this menu.

  void

  void

  Adds a separator line, or a hypen, to the menu at the current position.

  int

  Gets the AccessibleContext associated with this Menu.

  Gets the item located at the specified index of this menu.

  int

  Get the number of items in this menu.

  void

  Inserts a menu item into this menu at the specified position.

  void

  Inserts a menu item with the specified label into this menu at the specified position.

  void

  Inserts a separator at the specified position.

  boolean

  Indicates whether this menu is a tear-off menu.

  Returns a string representing the state of this Menu.

  void

  Removes the menu item at the specified index from this menu.

  void

  Removes the specified menu item from this menu.

  void

  Removes all items from this menu.

  void

  addActionListener, deleteShortcut, disable, disableEvents, enable, enable, enableEvents, getActionCommand, getActionListeners, getLabel, getListeners, getShortcut, isEnabled, processActionEvent, processEvent, removeActionListener, setActionCommand, setEnabled, setLabel, setShortcut

• Constructor Details
  • Menu

    Constructs a new menu with an empty label. This menu is not a tear-off menu.

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

    Since:

    1.1

    See Also:

    • GraphicsEnvironment.isHeadless()

  • Menu

    Constructs a new menu with the specified label. This menu is not a tear-off menu.

    Parameters:

    label - the menu's label in the menu bar, or in another menu of which this menu is a submenu.

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

    See Also:

    • GraphicsEnvironment.isHeadless()

  • Menu

    Tear-off functionality may not be supported by all implementations of AWT. If a particular implementation doesn't support tear-off menus, this value is silently ignored.

    Parameters:

    label - the menu's label in the menu bar, or in another menu of which this menu is a submenu.

    tearOff - if true, the menu is a tear-off menu.

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

    See Also:

    • GraphicsEnvironment.isHeadless()

• Method Details
  • addNotify

    public void addNotify()

    Creates the menu's peer. The peer allows us to modify the appearance of the menu without changing its functionality.

    Overrides:

    addNotify in class MenuItem

  • removeNotify

    public void removeNotify()

    Removes the menu's peer. The peer allows us to modify the appearance of the menu without changing its functionality.

    Overrides:

    removeNotify in class MenuComponent

  • isTearOff

    public boolean isTearOff()

    Tear-off functionality may not be supported by all implementations of AWT. If a particular implementation doesn't support tear-off menus, this value is silently ignored.

    Returns:

    true if this is a tear-off menu; false otherwise.

  • getItemCount

    public int getItemCount()

    Get the number of items in this menu.

    Returns:

    the number of items in this menu

    Since:

    1.1

  • countItems

    Returns the number of items in this menu.

    Returns:

    the number of items in this menu

  • getItem

    Gets the item located at the specified index of this menu.

    Parameters:

    index - the position of the item to be returned.

    Returns:

    the item located at the specified index.

  • add

    Adds an item with the specified label to this menu.

    Parameters:

    label - the text on the item

    See Also:

    • insert(java.lang.String, int)
    • insert(java.awt.MenuItem, int)

  • insert public void insert(String label, int index)

    Inserts a menu item with the specified label into this menu at the specified position. This is a convenience method for insert(menuItem, index).

    Parameters:

    label - the text on the item

    index - the position at which the menu item should be inserted

    Throws:

    IllegalArgumentException - if the value of index is less than zero

    Since:

    1.1

    See Also:

    • add(java.lang.String)
    • add(java.awt.MenuItem)

  • addSeparator

    public void addSeparator()

    Adds a separator line, or a hypen, to the menu at the current position.

    See Also:

    • insertSeparator(int)

  • insertSeparator

    public void insertSeparator(int index)

    Inserts a separator at the specified position.

    Parameters:

    index - the position at which the menu separator should be inserted.

    Throws:

    IllegalArgumentException - if the value of index is less than 0.

    Since:

    1.1

    See Also:

    • addSeparator()

  • remove

    public void remove(int index)

    Removes the menu item at the specified index from this menu.

    Parameters:

    index - the position of the item to be removed.

  • removeAll

    public void removeAll()

    Removes all items from this menu.

    Since:

    1.1

  • paramString

    Returns a string representing the state of this Menu. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.

    Overrides:

    paramString in class MenuItem

    Returns:

    the parameter string of this menu

  • getAccessibleContext

    Gets the AccessibleContext associated with this Menu. For menus, the AccessibleContext takes the form of an AccessibleAWTMenu. A new AccessibleAWTMenu instance is created if necessary.

    Specified by:

    getAccessibleContext in interface Accessible

    Overrides:

    getAccessibleContext in class MenuItem

    Returns:

    an AccessibleAWTMenu that serves as the AccessibleContext of this Menu

    Since:

    1.3

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