MenuComponent (Java Platform SE 8 ) (original) (raw)

• java.lang.Object

• • java.awt.MenuComponent

• All Implemented Interfaces:
  Serializable
  Direct Known Subclasses:
  MenuBar, MenuItem

public abstract class MenuComponent
extends Object
implements Serializable
The abstract class MenuComponent is the superclass of all menu-related components. In this respect, the classMenuComponent is analogous to the abstract superclassComponent for AWT components.
Menu components receive and process AWT events, just as components do, through the method processEvent.
Since:
JDK1.0
See Also:
Serialized Form

• • Nested Class Summary

  Nested Classes

  Modifier and Type	Class	Description
  protected class	MenuComponent.AccessibleAWTMenuComponent	Inner class of MenuComponent used to provide default support for accessibility.

  • Constructor Summary

  Constructors

  Constructor	Description
  MenuComponent()	Creates a MenuComponent.

  • Method Summary

  All Methods Instance Methods Concrete Methods Deprecated Methods

  Modifier and Type	Method	Description
  void	dispatchEvent(AWTEvent e)	Delivers an event to this component or one of its sub components.
  AccessibleContext	getAccessibleContext()	Gets the AccessibleContext associated with this MenuComponent.
  Font	getFont()	Gets the font used for this menu component.
  String	getName()	Gets the name of the menu component.
  MenuContainer	getParent()	Returns the parent container for this menu component.
  java.awt.peer.MenuComponentPeer	getPeer()	Deprecated.
  protected Object	getTreeLock()	Gets this component's locking object (the object that owns the thread synchronization monitor) for AWT component-tree and layout operations.
  protected String	paramString()	Returns a string representing the state of thisMenuComponent.
  boolean	postEvent(Event evt)	Deprecated.
  protected void	processEvent(AWTEvent e)	Processes events occurring on this menu component.
  void	removeNotify()	Removes the menu component's peer.
  void	setFont(Font f)	Sets the font to be used for this menu component to the specified font.
  void	setName(String name)	Sets the name of the component to the specified string.
  String	toString()	Returns a representation of this menu component as a string.

     * ### Methods inherited from class java.lang.[Object](../../java/lang/Object.html "class in java.lang")  
     `[clone](../../java/lang/Object.html#clone--), [equals](../../java/lang/Object.html#equals-java.lang.Object-), [finalize](../../java/lang/Object.html#finalize--), [getClass](../../java/lang/Object.html#getClass--), [hashCode](../../java/lang/Object.html#hashCode--), [notify](../../java/lang/Object.html#notify--), [notifyAll](../../java/lang/Object.html#notifyAll--), [wait](../../java/lang/Object.html#wait--), [wait](../../java/lang/Object.html#wait-long-), [wait](../../java/lang/Object.html#wait-long-int-)`

• • Constructor Detail

     * #### MenuComponent  
     public MenuComponent()  
                   throws [HeadlessException](../../java/awt/HeadlessException.html "class in java.awt")  
     Creates a `MenuComponent`.  
     Throws:  
     `[HeadlessException](../../java/awt/HeadlessException.html "class in java.awt")` \- if`GraphicsEnvironment.isHeadless` returns `true`  
     See Also:  
     [GraphicsEnvironment.isHeadless()](../../java/awt/GraphicsEnvironment.html#isHeadless--)  

  • Method Detail

    * #### getName  
    public [String](../../java/lang/String.html "class in java.lang") getName()  
    Gets the name of the menu component.  
    Returns:  
    the name of the menu component  
    Since:  
    JDK1.1  
    See Also:  
    [setName(java.lang.String)](../../java/awt/MenuComponent.html#setName-java.lang.String-)  
    * #### setName  
    public void setName([String](../../java/lang/String.html "class in java.lang") name)  
    Sets the name of the component to the specified string.  
    Parameters:  
    `name` \- the name of the menu component  
    Since:  
    JDK1.1  
    See Also:  
    [getName()](../../java/awt/MenuComponent.html#getName--)  
    * #### getParent  
    public [MenuContainer](../../java/awt/MenuContainer.html "interface in java.awt") getParent()  
    Returns the parent container for this menu component.  
    Returns:  
    the menu component containing this menu component, or `null` if this menu component is the outermost component, the menu bar itself  
    * #### getPeer  
    [@Deprecated](../../java/lang/Deprecated.html "annotation in java.lang")  
    public java.awt.peer.MenuComponentPeer getPeer()  
    Deprecated.  
    * #### getFont  
    public [Font](../../java/awt/Font.html "class in java.awt") getFont()  
    Gets the font used for this menu component.  
    Returns:  
    the font used in this menu component, if there is one;`null` otherwise  
    See Also:  
    [setFont(java.awt.Font)](../../java/awt/MenuComponent.html#setFont-java.awt.Font-)  
    * #### setFont  
    public void setFont([Font](../../java/awt/Font.html "class in java.awt") f)  
    Sets the font to be used for this menu component to the specified font. This font is also used by all subcomponents of this menu component, unless those subcomponents specify a different font.  
     Some platforms may not support setting of all font attributes of a menu component; in such cases, calling `setFont` will have no effect on the unsupported font attributes of this menu component. Unless subcomponents of this menu component specify a different font, this font will be used by those subcomponents if supported by the underlying platform.  
    Parameters:  
    `f` \- the font to be set  
    See Also:  
    [getFont()](../../java/awt/MenuComponent.html#getFont--), [Font.getAttributes()](../../java/awt/Font.html#getAttributes--), [TextAttribute](../../java/awt/font/TextAttribute.html "class in java.awt.font")  
    * #### removeNotify  
    public void removeNotify()  
    Removes the menu component's peer. The peer allows us to modify the appearance of the menu component without changing the functionality of the menu component.  
    * #### postEvent  
    [@Deprecated](../../java/lang/Deprecated.html "annotation in java.lang")  
    public boolean postEvent([Event](../../java/awt/Event.html "class in java.awt") evt)  
    Deprecated.  
    Posts the specified event to the menu. This method is part of the Java 1.0 event system and it is maintained only for backwards compatibility. Its use is discouraged, and it may not be supported in the future.  
    Parameters:  
    `evt` \- the event which is to take place  
    * #### dispatchEvent  
    public final void dispatchEvent([AWTEvent](../../java/awt/AWTEvent.html "class in java.awt") e)  
    Delivers an event to this component or one of its sub components.  
    Parameters:  
    `e` \- the event  
    * #### processEvent  
    protected void processEvent([AWTEvent](../../java/awt/AWTEvent.html "class in java.awt") e)  
    Processes events occurring on this menu component.  
    Note that if the event parameter is `null` the behavior is unspecified and may result in an exception.  
    Parameters:  
    `e` \- the event  
    Since:  
    JDK1.1  
    * #### paramString  
    protected [String](../../java/lang/String.html "class in java.lang") paramString()  
    Returns a string representing the state of this`MenuComponent`. 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`.  
    Returns:  
    the parameter string of this menu component  
    * #### toString  
    public [String](../../java/lang/String.html "class in java.lang") toString()  
    Returns a representation of this menu component as a string.  
    Overrides:  
    `[toString](../../java/lang/Object.html#toString--)` in class `[Object](../../java/lang/Object.html "class in java.lang")`  
    Returns:  
    a string representation of this menu component  
    * #### getTreeLock  
    protected final [Object](../../java/lang/Object.html "class in java.lang") getTreeLock()  
    Gets this component's locking object (the object that owns the thread synchronization monitor) for AWT component-tree and layout operations.  
    Returns:  
    this component's locking object  
    * #### getAccessibleContext  
    public [AccessibleContext](../../javax/accessibility/AccessibleContext.html "class in javax.accessibility") getAccessibleContext()  
    Gets the `AccessibleContext` associated with this `MenuComponent`. The method implemented by this base class returns `null`. Classes that extend `MenuComponent` should implement this method to return the`AccessibleContext` associated with the subclass.  
    Returns:  
    the `AccessibleContext` of this`MenuComponent`  
    Since:  
    1.3

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