ChangeNotifier (JOSM)

java.lang.Object
- org.openstreetmap.josm.gui.util.ChangeNotifier

Direct Known Subclasses:

AbstractListMergeModel, AbstractTextComponentValidator, HelpBrowserHistory, HistoryBrowserModel, PluginPreferencesModel, PropertiesMergeModel
```
public class ChangeNotifier
extends java.lang.Object
```
Replacement to java.util.Observable class, deprecated with Java 9.

Since:

10210

Field Summary

Fields
Modifier and Type	Field	Description
`private javax.swing.event.ChangeEvent`	`changeEvent`	Only one `ChangeEvent` is needed per button model instance since the event's only state is the source property.
`private javax.swing.event.EventListenerList`	`listenerList`	Stores the listeners on this model.

Constructor Summary

Constructors
Constructor Description

ChangeNotifier()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addChangeListener(javax.swing.event.ChangeListener l)`	Adds a `ChangeListener`.
`protected void`	`fireStateChanged()`	Notifies all listeners that have registered interest for notification on this event type.
`void`	`removeChangeListener(javax.swing.event.ChangeListener l)`	Removes a `ChangeListener`.

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

- Field Detail
  - listenerList
```
private final javax.swing.event.EventListenerList listenerList
```
    Stores the listeners on this model.
  - changeEvent
```
private javax.swing.event.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".
- Constructor Detail
  - ChangeNotifier
```
public ChangeNotifier()
```
- Method Detail
  - addChangeListener
```
public final void addChangeListener(javax.swing.event.ChangeListener l)
```
    Adds a ChangeListener.
    
    Parameters:
    
    l - the listener to add
  - removeChangeListener
```
public final void removeChangeListener(javax.swing.event.ChangeListener l)
```
    Removes a ChangeListener.
    
    Parameters:
    
    l - the listener to add
  - fireStateChanged
```
protected final void fireStateChanged()
```
    Notifies all listeners that have registered interest for notification on this event type. The event instance is created lazily.