java.util.prefs

Class PreferenceChangeEvent

java.lang.Object

java.util.EventObject

java.util.prefs.PreferenceChangeEvent

All Implemented Interfaces:

Serializable

public class PreferenceChangeEvent
extends EventObject

ObjectEvent fired when a Preferences entry changes. This event is generated when a entry is added, changed or removed. When an entry is removed then getNewValue will return null.

Preference change events are only generated for entries in one particular preference node. Notification of subnode addition/removal is given by a NodeChangeEvent.

Note that although this class is marked as serializable, attempts to serialize it will fail with NotSerializableException.

Since:

1.4

See Also:

Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor and Description
PreferenceChangeEvent(Preferences node, String key, String value) Creates a new PreferenceChangeEvent.

Method Summary

Methods

Modifier and Type	Method and Description
String	getKey() Returns the key of the entry that was added, changed or removed.
String	getNewValue() Returns the new value of the entry that was added or changed, or returns null when the entry was removed.
Preferences	getNode() Returns the source Preference node from which an entry was added, changed or removed.

Methods inherited from class java.util.EventObject

getSource, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

PreferenceChangeEvent

public PreferenceChangeEvent(Preferences node,
                     String key,
                     String value)

Creates a new PreferenceChangeEvent.

Parameters:

node - The source preference node for which an entry was added, changed or removed

key - The key of the entry that was added, changed or removed

value - The new value of the entry that was added or changed, or null when the entry was removed

Method Detail

getNode

public Preferences getNode()

Returns the source Preference node from which an entry was added, changed or removed.

getKey

public String getKey()

Returns the key of the entry that was added, changed or removed.

getNewValue

public String getNewValue()

Returns the new value of the entry that was added or changed, or returns null when the entry was removed.