DefaultButtonModel

java.lang.Object
- javax.swing.DefaultButtonModel

All Implemented Interfaces:

ItemSelectable, Serializable, ButtonModel

Direct Known Subclasses:

JToggleButton.ToggleButtonModel
```
public class DefaultButtonModel
extends Object
implements ButtonModel, Serializable
```
The default implementation of a Button component's data model.
Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans^TM has been added to the java.beans package. Please see XMLEncoder.

Field Summary

Fields
Modifier and Type	Field and Description
`protected String`	`actionCommand` The action command string fired by the button.
`static int`	`ARMED` Identifies the "armed" bit in the bitmask, which indicates partial commitment towards choosing/triggering the button.
`protected ChangeEvent`	`changeEvent` Only one `ChangeEvent` is needed per button model instance since the event's only state is the source property.
`static int`	`ENABLED` Identifies the "enabled" bit in the bitmask, which indicates that the button can be selected by an input device (such as a mouse pointer).
`protected ButtonGroup`	`group` The button group that the button belongs to.
`protected EventListenerList`	`listenerList` Stores the listeners on this model.
`protected int`	`mnemonic` The button's mnemonic.
`static int`	`PRESSED` Identifies the "pressed" bit in the bitmask, which indicates that the button is pressed.
`static int`	`ROLLOVER` Identifies the "rollover" bit in the bitmask, which indicates that the mouse is over the button.
`static int`	`SELECTED` Identifies the "selected" bit in the bitmask, which indicates that the button has been selected.
`protected int`	`stateMask` The bitmask used to store the state of the button.

Constructor Summary

Constructors
Constructor and Description

DefaultButtonModel()
Constructs a DefaultButtonModel.

Constructors
Constructor and Description
`DefaultButtonModel()` Constructs a `DefaultButtonModel`.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addActionListener(ActionListener l)` Adds an `ActionListener` to the model.
`void`	`addChangeListener(ChangeListener l)` Adds a `ChangeListener` to the model.
`void`	`addItemListener(ItemListener l)` Adds an `ItemListener` to the model.
`protected void`	`fireActionPerformed(ActionEvent e)` Notifies all listeners that have registered interest for notification on this event type.
`protected void`	`fireItemStateChanged(ItemEvent e)` Notifies all listeners that have registered interest for notification on this event type.
`protected void`	`fireStateChanged()` Notifies all listeners that have registered interest for notification on this event type.
`String`	`getActionCommand()` Returns the action command string for the button.
`ActionListener[]`	`getActionListeners()` Returns an array of all the action listeners registered on this `DefaultButtonModel`.
`ChangeListener[]`	`getChangeListeners()` Returns an array of all the change listeners registered on this `DefaultButtonModel`.
`ButtonGroup`	`getGroup()` Returns the group that the button belongs to.
`ItemListener[]`	`getItemListeners()` Returns an array of all the item listeners registered on this `DefaultButtonModel`.
`<T extends EventListener> T[]`	`getListeners(Class<T> listenerType)` Returns an array of all the objects currently registered as `FooListener`s upon this model.
`int`	`getMnemonic()` Gets the keyboard mnemonic for the button.
`Object[]`	`getSelectedObjects()` Overridden to return `null`.
`boolean`	`isArmed()` Indicates partial commitment towards triggering the button.
`boolean`	`isEnabled()` Indicates if the button can be selected or triggered by an input device, such as a mouse pointer.
`boolean`	`isPressed()` Indicates if the button is pressed.
`boolean`	`isRollover()` Indicates that the mouse is over the button.
`boolean`	`isSelected()` Indicates if the button has been selected.
`void`	`removeActionListener(ActionListener l)` Removes an `ActionListener` from the model.
`void`	`removeChangeListener(ChangeListener l)` Removes a `ChangeListener` from the model.
`void`	`removeItemListener(ItemListener l)` Removes an `ItemListener` from the model.
`void`	`setActionCommand(String actionCommand)` Sets the action command string that gets sent as part of the `ActionEvent` when the button is triggered.
`void`	`setArmed(boolean b)` Marks the button as armed or unarmed.
`void`	`setEnabled(boolean b)` Enables or disables the button.
`void`	`setGroup(ButtonGroup group)` Identifies the group the button belongs to -- needed for radio buttons, which are mutually exclusive within their group.
`void`	`setMnemonic(int key)` Sets the keyboard mnemonic (shortcut key or accelerator key) for the button.
`void`	`setPressed(boolean b)` Sets the button to pressed or unpressed.
`void`	`setRollover(boolean b)` Sets or clears the button's rollover state
`void`	`setSelected(boolean b)` Selects or deselects the button.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - stateMask
```
protected int stateMask
```
    The bitmask used to store the state of the button.
  - actionCommand
```
protected String actionCommand
```
    The action command string fired by the button.
  - group
```
protected ButtonGroup group
```
    The button group that the button belongs to.
  - mnemonic
```
protected int mnemonic
```
    The button's mnemonic.
  - changeEvent
```
protected transient ChangeEvent changeEvent
```
    Only one ChangeEvent is needed per button model instance since the event's only state is the source property. The source of events generated is always "this".
  - listenerList
```
protected EventListenerList listenerList
```
    Stores the listeners on this model.
  - ARMED
```
public static final int ARMED
```
    Identifies the "armed" bit in the bitmask, which indicates partial commitment towards choosing/triggering the button.
    
    See Also:
    Constant Field Values
  - SELECTED
```
public static final int SELECTED
```
    Identifies the "selected" bit in the bitmask, which indicates that the button has been selected. Only needed for certain types of buttons - such as radio button or check box.
    
    See Also:
    Constant Field Values
  - PRESSED
```
public static final int PRESSED
```
    Identifies the "pressed" bit in the bitmask, which indicates that the button is pressed.
    
    See Also:
    Constant Field Values
  - ENABLED
```
public static final int ENABLED
```
    Identifies the "enabled" bit in the bitmask, which indicates that the button can be selected by an input device (such as a mouse pointer).
    
    See Also:
    Constant Field Values
  - ROLLOVER
```
public static final int ROLLOVER
```
    Identifies the "rollover" bit in the bitmask, which indicates that the mouse is over the button.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - DefaultButtonModel
```
public DefaultButtonModel()
```
    Constructs a DefaultButtonModel.
- Method Detail
  - setActionCommand
```
public void setActionCommand(String actionCommand)
```
    Sets the action command string that gets sent as part of the ActionEvent when the button is triggered.
    
    Specified by:
    
    setActionCommand in interface ButtonModel
    
    Parameters:
    actionCommand - the String that identifies the generated event
    See Also:
    ButtonModel.getActionCommand(), ActionEvent.getActionCommand()
  - getActionCommand
```
public String getActionCommand()
```
    Returns the action command string for the button.
    
    Specified by:
    
    getActionCommand in interface ButtonModel
    
    Returns:
    the String that identifies the generated event
    See Also:
    ButtonModel.setActionCommand(java.lang.String)
  - isArmed
```
public boolean isArmed()
```
    Indicates partial commitment towards triggering the button.
    
    Specified by:
    
    isArmed in interface ButtonModel
    
    Returns:
    true if the button is armed, and ready to be triggered
    See Also:
    ButtonModel.setArmed(boolean)
  - isSelected
```
public boolean isSelected()
```
    Indicates if the button has been selected. Only needed for certain types of buttons - such as radio buttons and check boxes.
    
    Specified by:
    
    isSelected in interface ButtonModel
    
    Returns:
    true if the button is selected
  - isEnabled
```
public boolean isEnabled()
```
    Indicates if the button can be selected or triggered by an input device, such as a mouse pointer.
    
    Specified by:
    
    isEnabled in interface ButtonModel
    
    Returns:
    true if the button is enabled
  - isPressed
```
public boolean isPressed()
```
    Indicates if the button is pressed.
    
    Specified by:
    
    isPressed in interface ButtonModel
    
    Returns:
    true if the button is pressed
  - isRollover
```
public boolean isRollover()
```
    Indicates that the mouse is over the button.
    
    Specified by:
    
    isRollover in interface ButtonModel
    
    Returns:
    true if the mouse is over the button
  - setArmed
```
public void setArmed(boolean b)
```
    Marks the button as armed or unarmed.
    
    Specified by:
    
    setArmed in interface ButtonModel
    
    Parameters:
    b - whether or not the button should be armed
  - setEnabled
```
public void setEnabled(boolean b)
```
    Enables or disables the button.
    
    Specified by:
    
    setEnabled in interface ButtonModel
    
    Parameters:
    b - whether or not the button should be enabled
    See Also:
    ButtonModel.isEnabled()
  - setSelected
```
public void setSelected(boolean b)
```
    Selects or deselects the button.
    
    Specified by:
    
    setSelected in interface ButtonModel
    
    Parameters:
    b - true selects the button, false deselects the button
  - setPressed
```
public void setPressed(boolean b)
```
    Sets the button to pressed or unpressed.
    
    Specified by:
    
    setPressed in interface ButtonModel
    
    Parameters:
    b - whether or not the button should be pressed
    See Also:
    ButtonModel.isPressed()
  - setRollover
```
public void setRollover(boolean b)
```
    Sets or clears the button's rollover state
    
    Specified by:
    
    setRollover in interface ButtonModel
    
    Parameters:
    b - whether or not the button is in the rollover state
    See Also:
    ButtonModel.isRollover()
  - setMnemonic
```
public void setMnemonic(int key)
```
    Sets the keyboard mnemonic (shortcut key or accelerator key) for the button.
    
    Specified by:
    
    setMnemonic in interface ButtonModel
    
    Parameters:
    key - an int specifying the accelerator key
  - getMnemonic
```
public int getMnemonic()
```
    Gets the keyboard mnemonic for the button.
    
    Specified by:
    
    getMnemonic in interface ButtonModel
    
    Returns:
    an int specifying the accelerator key
    See Also:
    ButtonModel.setMnemonic(int)
  - addChangeListener
```
public void addChangeListener(ChangeListener l)
```
    Adds a ChangeListener to the model.
    
    Specified by:
    
    addChangeListener in interface ButtonModel
    
    Parameters:
    l - the listener to add
  - removeChangeListener
```
public void removeChangeListener(ChangeListener l)
```
    Removes a ChangeListener from the model.
    
    Specified by:
    
    removeChangeListener in interface ButtonModel
    
    Parameters:
    l - the listener to remove
  - getChangeListeners
```
public ChangeListener[] getChangeListeners()
```
    Returns an array of all the change listeners registered on this DefaultButtonModel.
    
    Returns:
    all of this model's ChangeListeners or an empty array if no change listeners are currently registered
    Since:
    
    1.4
    
    See Also:
    addChangeListener(javax.swing.event.ChangeListener), removeChangeListener(javax.swing.event.ChangeListener)
  - fireStateChanged
```
protected void fireStateChanged()
```
    Notifies all listeners that have registered interest for notification on this event type. The event instance is created lazily.
    
    See Also:
    EventListenerList
  - addActionListener
```
public void addActionListener(ActionListener l)
```
    Adds an ActionListener to the model.
    
    Specified by:
    
    addActionListener in interface ButtonModel
    
    Parameters:
    l - the listener to add
  - removeActionListener
```
public void removeActionListener(ActionListener l)
```
    Removes an ActionListener from the model.
    
    Specified by:
    
    removeActionListener in interface ButtonModel
    
    Parameters:
    l - the listener to remove
  - getActionListeners
```
public ActionListener[] getActionListeners()
```
    Returns an array of all the action listeners registered on this DefaultButtonModel.
    
    Returns:
    all of this model'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)
  - fireActionPerformed
```
protected void fireActionPerformed(ActionEvent e)
```
    Notifies all listeners that have registered interest for notification on this event type.
    
    Parameters:
    e - the ActionEvent to deliver to listeners
    See Also:
    EventListenerList
  - addItemListener
```
public void addItemListener(ItemListener l)
```
    Adds an ItemListener to the model.
    
    Specified by:
    
    addItemListener in interface ItemSelectable
    
    Specified by:
    
    addItemListener in interface ButtonModel
    
    Parameters:
    l - the listener to add
    See Also:
    ItemEvent
  - removeItemListener
```
public void removeItemListener(ItemListener l)
```
    Removes an ItemListener from the model.
    
    Specified by:
    
    removeItemListener in interface ItemSelectable
    
    Specified by:
    
    removeItemListener in interface ButtonModel
    
    Parameters:
    l - the listener to remove
    See Also:
    ItemEvent
  - getItemListeners
```
public ItemListener[] getItemListeners()
```
    Returns an array of all the item listeners registered on this DefaultButtonModel.
    
    Returns:
    all of this model's ItemListeners or an empty array if no item listeners are currently registered
    Since:
    
    1.4
    
    See Also:
    addItemListener(java.awt.event.ItemListener), removeItemListener(java.awt.event.ItemListener)
  - fireItemStateChanged
```
protected void fireItemStateChanged(ItemEvent e)
```
    Notifies all listeners that have registered interest for notification on this event type.
    
    Parameters:
    e - the ItemEvent to deliver to listeners
    See Also:
    EventListenerList
  - getListeners
```
public <T extends EventListener> T[] getListeners(Class<T> listenerType)
```
    Returns an array of all the objects currently registered as FooListeners upon this model. FooListeners 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 DefaultButtonModel instance 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.
    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 model, 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(), getChangeListeners(), getItemListeners()
  - getSelectedObjects
```
public Object[] getSelectedObjects()
```
    Overridden to return null.
    
    Specified by:
    
    getSelectedObjects in interface ItemSelectable
  - setGroup
```
public void setGroup(ButtonGroup group)
```
    Identifies the group the button belongs to -- needed for radio buttons, which are mutually exclusive within their group.
    
    Specified by:
    
    setGroup in interface ButtonModel
    
    Parameters:
    group - the ButtonGroup the button belongs to
  - getGroup
```
public ButtonGroup getGroup()
```
    Returns the group that the button belongs to. Normally used with radio buttons, which are mutually exclusive within their group.
    
    Returns:
    the ButtonGroup that the button belongs to
    Since:
    
    1.3

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Class DefaultButtonModel

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

stateMask

actionCommand

group

mnemonic

changeEvent

listenerList

ARMED

SELECTED

PRESSED

ENABLED

ROLLOVER

Constructor Detail

DefaultButtonModel

Method Detail

setActionCommand

getActionCommand

isArmed

isSelected

isEnabled

isPressed

isRollover

setArmed

setEnabled

setSelected

setPressed

setRollover

setMnemonic

getMnemonic

addChangeListener

removeChangeListener

getChangeListeners

fireStateChanged

addActionListener

removeActionListener

getActionListeners

fireActionPerformed

addItemListener

removeItemListener

getItemListeners

fireItemStateChanged

getListeners

getSelectedObjects

setGroup

getGroup