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

MenuItem (Java SE 19 & JDK 19)

All Implemented Interfaces:

Serializable, Accessible

Direct Known Subclasses:

CheckboxMenuItem, Menu

All items in a menu must belong to the class

, or one of its subclasses.

The default MenuItem object embodies a simple labeled menu item.

This picture of a menu bar shows five menu items:
The first two items are simple menu items, labeled "Basic" and "Simple". Following these two items is a separator, which is itself a menu item, created with the label "-". Next is an instance of CheckboxMenuItem labeled "Check". The final menu item is a submenu labeled "More Examples", and this submenu is an instance of Menu.

When a menu item is selected, AWT sends an action event to the menu item. Since the event is an instance of ActionEvent, the processEvent method examines the event and passes it along to processActionEvent. The latter method redirects the event to any ActionListener objects that have registered an interest in action events generated by this menu item.

Note that the subclass Menu overrides this behavior and does not send any event to the frame until one of its subitems is selected.

See Also:

• Serialized Form

• Nested Class Summary

  Nested Classes

  protected class 

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

• Constructor Summary

  Constructors

  Constructs a new MenuItem with an empty label and no keyboard shortcut.

  Constructs a new MenuItem with the specified label and no keyboard shortcut.

  Create a menu item with an associated keyboard shortcut.

• Method Summary

  void

  Adds the specified action listener to receive action events from this menu item.

  void

  Creates the menu item's peer.

  void

  Delete any MenuShortcut object associated with this menu item.

  void

  protected final void

  Disables event delivery to this menu item for events defined by the specified event mask parameter.

  void

  void

  protected final void

  Enables event delivery to this menu item for events to be defined by the specified event mask parameter

  Gets the AccessibleContext associated with this MenuItem.

  Gets the command name of the action event that is fired by this menu item.

  Returns an array of all the action listeners registered on this menu item.

  Gets the label for this menu item.

  Returns an array of all the objects currently registered as FooListeners upon this MenuItem.

  Get the MenuShortcut object associated with this menu item,

  boolean

  Checks whether this menu item is enabled.

  Returns a string representing the state of this MenuItem.

  protected void

  Processes action events occurring on this menu item, by dispatching them to any registered ActionListener objects.

  protected void

  Processes events on this menu item.

  void

  Removes the specified action listener so it no longer receives action events from this menu item.

  void

  Sets the command name of the action event that is fired by this menu item.

  void

  Sets whether or not this menu item can be chosen.

  void

  Sets the label for this menu item to the specified label.

  void

  Set the MenuShortcut object associated with this menu item.

• Constructor Details
  • MenuItem

    Constructs a new MenuItem with an empty label and no keyboard shortcut.

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

    Since:

    1.1

    See Also:

    • GraphicsEnvironment.isHeadless()

  • MenuItem

    Constructs a new MenuItem with the specified label and no keyboard shortcut. Note that use of "-" in a label is reserved to indicate a separator between menu items. By default, all menu items except for separators are enabled.

    Parameters:

    label - the label for this menu item.

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless() returns true.

    Since:

    1.0

    See Also:

    • GraphicsEnvironment.isHeadless()
• Method Details
  • addNotify

    public void addNotify()

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

  • getLabel

    Gets the label for this menu item.

    Returns:

    the label of this menu item, or null if this menu item has no label.

    Since:

    1.0

    See Also:

    • setLabel(java.lang.String)

  • setLabel public void setLabel(String label)

    Sets the label for this menu item to the specified label.

    Parameters:

    label - the new label, or null for no label.

    Since:

    1.0

    See Also:

    • getLabel()

  • isEnabled

    public boolean isEnabled()

    Checks whether this menu item is enabled.

    Returns:

    true if the item is enabled; otherwise false

    Since:

    1.0

    See Also:

    • setEnabled(boolean)

  • setEnabled

    public void setEnabled(boolean b)

    Sets whether or not this menu item can be chosen.

    Parameters:

    b - if true, enables this menu item; if false, disables it.

    Since:

    1.1

    See Also:

    • isEnabled()

  • enable
  • enable

    Sets whether or not this menu item can be chosen.

    Parameters:

    b - if true, enables this menu item; otherwise disables

  • disable
  • getShortcut

    Get the MenuShortcut object associated with this menu item,

    Returns:

    the menu shortcut associated with this menu item, or null if none has been specified.

    Since:

    1.1

    See Also:

    • setShortcut(java.awt.MenuShortcut)

  • deleteShortcut

    public void deleteShortcut()

    Delete any MenuShortcut object associated with this menu item.

    Since:

    1.1

  • enableEvents

    protected final void enableEvents(long eventsToEnable)

    Since event types are automatically enabled when a listener for that type is added to the menu item, this method only needs to be invoked by subclasses of MenuItem which desire to have the specified event types delivered to processEvent regardless of whether a listener is registered.

    Parameters:

    eventsToEnable - the event mask defining the event types

    Since:

    1.1

    See Also:

    • processEvent(java.awt.AWTEvent)
    • disableEvents(long)
    • Component.enableEvents(long)

  • disableEvents

    protected final void disableEvents(long eventsToDisable)

    Disables event delivery to this menu item for events defined by the specified event mask parameter.

    Parameters:

    eventsToDisable - the event mask defining the event types

    Since:

    1.1

    See Also:

    • processEvent(java.awt.AWTEvent)
    • enableEvents(long)
    • Component.disableEvents(long)

  • setActionCommand public void setActionCommand(String command)

    By default, the action command is set to the label of the menu item.

    Parameters:

    command - the action command to be set for this menu item.

    Since:

    1.1

    See Also:

    • getActionCommand()

  • getActionCommand public String getActionCommand

    ()

    Gets the command name of the action event that is fired by this menu item.

    Returns:

    the action command name

    Since:

    1.1

    See Also:

    • setActionCommand(java.lang.String)

  • addActionListener

    Refer to AWT Threading Issues for details on AWT's threading model.

    Parameters:

    l - the action listener.

    Since:

    1.1

    See Also:

    • removeActionListener(java.awt.event.ActionListener)
    • getActionListeners()
    • ActionEvent
    • ActionListener

  • removeActionListener

    Refer to AWT Threading Issues for details on AWT's threading model.

    Parameters:

    l - the action listener.

    Since:

    1.1

    See Also:

    • addActionListener(java.awt.event.ActionListener)
    • getActionListeners()
    • ActionEvent
    • ActionListener

  • getActionListeners

    Returns an array of all the action listeners registered on this menu item.

    Returns:

    all of this menu item's ActionListeners or an empty array if no action listeners are currently registered

    Since:

    1.4

    See Also:

    • addActionListener(java.awt.event.ActionListener)
    • removeActionListener(java.awt.event.ActionListener)
    • ActionEvent
    • ActionListener

  • getListeners

    Returns an array of all the objects currently registered as

    FooListener

    s upon this

    MenuItem

    .

    FooListener

    s are registered using the

    addFooListener

    method.

    You can specify the listenerType argument with a class literal, such as FooListener.class. For example, you can query a MenuItem m for its action listeners with the following code:

    ActionListener[] als = (ActionListener[])(m.getListeners(ActionListener.class));

    If no such listeners exist, this method returns an empty array.

    Type Parameters:

    T - the type of the listeners

    Parameters:

    listenerType - the type of listeners requested; this parameter should specify an interface that descends from java.util.EventListener

    Returns:

    an array of all objects registered as FooListeners on this menu item, or an empty array if no such listeners have been added

    Throws:

    ClassCastException - if listenerType doesn't specify a class or interface that implements java.util.EventListener

    Since:

    1.3

    See Also:

    • getActionListeners()

  • processEvent

    Processes events on this menu item. If the event is an instance of

    ActionEvent

    , it invokes

    processActionEvent

    , another method defined by

    MenuItem

    .

    Currently, menu items only support action events.

    Note that if the event parameter is null the behavior is unspecified and may result in an exception.

    Overrides:

    processEvent in class MenuComponent

    Parameters:

    e - the event

    Since:

    1.1

    See Also:

    • processActionEvent(java.awt.event.ActionEvent)

  • processActionEvent

    Processes action events occurring on this menu item, by dispatching them to any registered

    ActionListener

    objects. This method is not called unless action events are enabled for this component. Action events are enabled when one of the following occurs:

    • An ActionListener object is registered via addActionListener.
    • Action events are enabled via enableEvents.

    Note that if the event parameter is null the behavior is unspecified and may result in an exception.

    Parameters:

    e - the action event

    Since:

    1.1

    See Also:

    • ActionEvent
    • ActionListener
    • enableEvents(long)

  • paramString

    Returns a string representing the state of this MenuItem. 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 MenuComponent

    Returns:

    the parameter string of this menu item

  • getAccessibleContext

    Gets the AccessibleContext associated with this MenuItem. For menu items, the AccessibleContext takes the form of an AccessibleAWTMenuItem. A new AccessibleAWTMenuItem instance is created if necessary.

    Specified by:

    getAccessibleContext in interface Accessible

    Overrides:

    getAccessibleContext in class MenuComponent

    Returns:

    an AccessibleAWTMenuItem that serves as the AccessibleContext of this MenuItem

    Since:

    1.3

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