Java Module java.desktop Package javax.swing Class DefaultButtonModel（JDK11）

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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™ has been added to the java.beans package. Please see XMLEncoder.

Since:

1.2

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	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	Description
`DefaultButtonModel()`	Constructs a `DefaultButtonModel`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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.
`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.
`Object[]`	`getSelectedObjects()`	Overridden to return `null`.

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

Methods declared in interface javax.swing.ButtonModel
addActionListener, addChangeListener, addItemListener, getActionCommand, getMnemonic, isArmed, isEnabled, isPressed, isRollover, isSelected, removeActionListener, removeChangeListener, removeItemListener, setActionCommand, setArmed, setEnabled, setGroup, setMnemonic, setPressed, setRollover, setSelected

- 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
  - 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:
    
    ButtonModel.addChangeListener(javax.swing.event.ChangeListener), ButtonModel.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
  - 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:
    
    ButtonModel.addActionListener(java.awt.event.ActionListener), ButtonModel.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
  - 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:
    
    ButtonModel.addItemListener(java.awt.event.ItemListener), ButtonModel.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.
    Type Parameters:
    
    T - the type of requested 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 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
    
    Returns:
    
    the list of selected objects, or null
  - getGroup
```
public ButtonGroup getGroup()
```
    Returns the group that the button belongs to. Normally used with radio buttons, which are mutually exclusive within their group.
    
    Specified by:
    
    getGroup in interface ButtonModel
    
    Returns:
    
    the ButtonGroup that the button belongs to
    
    Since:
    
    1.3

Java Module java.desktop Package javax.swing Class DefaultButtonModel（JDK11）

Class DefaultButtonModel

Field Summary

Constructor Summary

Method Summary

Methods declared in class java.lang.Object

Methods declared in interface javax.swing.ButtonModel

Field Detail

stateMask

actionCommand

group

mnemonic

changeEvent

listenerList

ARMED

SELECTED

PRESSED

ENABLED

ROLLOVER

Constructor Detail

DefaultButtonModel

Method Detail

getChangeListeners

fireStateChanged

getActionListeners

fireActionPerformed

getItemListeners

fireItemStateChanged

getListeners

getSelectedObjects

getGroup