java.awt

Class CheckboxMenuItem

java.lang.Object

java.awt.MenuComponent

java.awt.MenuItem

java.awt.CheckboxMenuItem

All Implemented Interfaces:

ItemSelectable, Serializable, Accessible

public class CheckboxMenuItem
extends MenuItem
implements ItemSelectable, Accessible

This class implements a menu item that has a checkbox on it indicating the selected state of some option.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	CheckboxMenuItem.AccessibleAWTCheckboxMenuItem

Nested classes/interfaces inherited from class java.awt.MenuItem

MenuItem.AccessibleAWTMenuItem

Nested classes/interfaces inherited from class java.awt.MenuComponent

MenuComponent.AccessibleAWTMenuComponent

Constructor Summary

Constructors

Constructor and Description
CheckboxMenuItem() Initializes a new instance of CheckboxMenuItem with no label and an initial state of off.
CheckboxMenuItem(String label) Initializes a new instance of CheckboxMenuItem with the specified label and an initial state of off.
CheckboxMenuItem(String label, boolean state) Initializes a new instance of CheckboxMenuItem with the specified label and initial state.

Method Summary

Methods

Modifier and Type	Method and Description
void	addItemListener(ItemListener listener) Adds the specified listener to the list of registered item listeners for this object.
void	addNotify() Create's this object's native peer
AccessibleContext	getAccessibleContext() Gets the AccessibleContext associated with this CheckboxMenuItem.
ItemListener[]	getItemListeners() Returns an aray of all item listeners currently registered to this CheckBoxMenuItem.
<T extends EventListener> T[]	getListeners(Class<T> listenerType) Returns an array of all the objects currently registered as FooListeners upon this CheckboxMenuItem.
Object[]	getSelectedObjects() Returns an array of length 1 with the menu item label for this object if the state is on.
boolean	getState() Returns the state of this menu item.
String	paramString() Returns a debugging string for this object.
protected void	processEvent(AWTEvent event) Processes the specified event by calling processItemEvent() if it is an instance of ItemEvent or calling the superclass method otherwise.
protected void	processItemEvent(ItemEvent event) Processes the specified event by dispatching it to any registered listeners.
void	removeItemListener(ItemListener listener) Removes the specified listener from the list of registered item listeners for this object.
void	setState(boolean state) Sets the state of this menu item.

Methods inherited from class java.awt.MenuItem

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

Methods inherited from class java.awt.MenuComponent

dispatchEvent, getFont, getName, getParent, getPeer, getTreeLock, postEvent, removeNotify, setFont, setName, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

CheckboxMenuItem

public CheckboxMenuItem()

Initializes a new instance of CheckboxMenuItem with no label and an initial state of off.

Throws:

HeadlessException - If GraphicsEnvironment.isHeadless() returns true.

CheckboxMenuItem

public CheckboxMenuItem(String label)

Initializes a new instance of CheckboxMenuItem with the specified label and an initial state of off.

Parameters:

label - The label of the menu item.

Throws:

HeadlessException - If GraphicsEnvironment.isHeadless() returns true.

CheckboxMenuItem

public CheckboxMenuItem(String label,
                boolean state)

Initializes a new instance of CheckboxMenuItem with the specified label and initial state.

Parameters:

label - The label of the menu item.

state - The initial state of the menu item, where true is on, and false is off.

Throws:

HeadlessException - If GraphicsEnvironment.isHeadless() returns true.

Method Detail

getState

public boolean getState()

Returns the state of this menu item.

Returns:

The state of this menu item.

setState

public void setState(boolean state)

Sets the state of this menu item.

Parameters:

state - The initial state of the menu item, where true is on, and false is off.

getSelectedObjects

public Object[] getSelectedObjects()

Returns an array of length 1 with the menu item label for this object if the state is on. Otherwise null is returned.

Specified by:

getSelectedObjects in interface ItemSelectable

Returns:

An array with this menu item's label if it has a state of on, or null otherwise.

addNotify

public void addNotify()

Create's this object's native peer

Overrides:

addNotify in class MenuItem

addItemListener

public void addItemListener(ItemListener listener)

Adds the specified listener to the list of registered item listeners for this object.

Specified by:

addItemListener in interface ItemSelectable

Parameters:

listener - The listener to add.

removeItemListener

public void removeItemListener(ItemListener listener)

Removes the specified listener from the list of registered item listeners for this object.

Specified by:

removeItemListener in interface ItemSelectable

Parameters:

listener - The listener to remove.

processEvent

protected void processEvent(AWTEvent event)

Processes the specified event by calling processItemEvent() if it is an instance of ItemEvent or calling the superclass method otherwise.

Overrides:

processEvent in class MenuItem

Parameters:

event - The event to process.

processItemEvent

protected void processItemEvent(ItemEvent event)

Processes the specified event by dispatching it to any registered listeners.

Parameters:

event - The event to process.

paramString

public String paramString()

Returns a debugging string for this object.

Overrides:

paramString in class MenuItem

Returns:

A debugging string for this object.

getListeners

public <T extends EventListener> T[] getListeners(Class<T> listenerType)

Returns an array of all the objects currently registered as FooListeners upon this CheckboxMenuItem. FooListeners are registered using the addFooListener method.

Overrides:

getListeners in class MenuItem

Throws:

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

getItemListeners

public ItemListener[] getItemListeners()

Returns an aray of all item listeners currently registered to this CheckBoxMenuItem.

getAccessibleContext

public AccessibleContext getAccessibleContext()

Gets the AccessibleContext associated with this CheckboxMenuItem. The context is created, if necessary.

Specified by:

getAccessibleContext in interface Accessible

Overrides:

getAccessibleContext in class MenuItem

Returns:

the associated context