java.util.prefs
Class PreferenceChangeEvent

java.lang.Object
  java.util.EventObject
      java.util.prefs.PreferenceChangeEvent

All Implemented Interfaces:

Serializable

public class PreferenceChangeEvent

extends EventObject

An event emitted by a Preferences node to indicate that a preference has been added, removed or has had its value changed.

Note, that although PreferenceChangeEvent inherits Serializable interface from EventObject, it is not intended to be Serializable. Appropriate serialization methods are implemented to throw NotSerializableException.

Since:

1.4

Author:

Josh Bloch

See Also:

Preferences, PreferenceChangeListener, NodeChangeEvent

Field Summary

private String	key Key of the preference that changed.
private String	newValue New value for preference, or null if it was removed.

Fields inherited from class java.util.EventObject

source

Constructor Summary

PreferenceChangeEvent(Preferences node, String key, String newValue)
Constructs a new PreferenceChangeEvent instance.

Method Summary

String	getKey() Returns the key of the preference that was changed.
String	getNewValue() Returns the new value for the preference.
Preferences	getNode() Returns the preference node that emitted the event.
private void	readObject(ObjectInputStream in) Throws NotSerializableException, since PreferenceChangeEvent objects are not intended to be serializable.
private void	writeObject(ObjectOutputStream out) Throws NotSerializableException, since NodeChangeEvent objects are not intended to be serializable.

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

Field Detail

key

private String key

Key of the preference that changed.

newValue

private String newValue

New value for preference, or null if it was removed.

Constructor Detail

PreferenceChangeEvent

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

Constructs a new PreferenceChangeEvent instance.

Parameters:

node - The Preferences node that emitted the event.

key - The key of the preference that was changed.

newValue - The new value of the preference, or null if the preference is being removed.

Method Detail

getNode

public Preferences getNode()

Returns the preference node that emitted the event.

Returns:

The preference node that emitted the event.

getKey

public String getKey()

Returns the key of the preference that was changed.

Returns:

The key of the preference that was changed.

getNewValue

public String getNewValue()

Returns the new value for the preference.

Returns:

The new value for the preference, or null if the preference was removed.

writeObject

private void writeObject(ObjectOutputStream out)
                  throws NotSerializableException

Throws NotSerializableException, since NodeChangeEvent objects are not intended to be serializable.

Throws:

NotSerializableException

readObject

private void readObject(ObjectInputStream in)
                 throws NotSerializableException

Throws NotSerializableException, since PreferenceChangeEvent objects are not intended to be serializable.

Throws:

NotSerializableException