Module javafx.base

Package javafx.beans.value

Class WeakChangeListener<T>

java.lang.Object

javafx.beans.value.WeakChangeListener<T>

Type Parameters:

T - The type of the observed value

All Implemented Interfaces:

ChangeListener<T>, WeakListener

public final class WeakChangeListener<T>
extends Object
implements ChangeListener<T>, WeakListener

A WeakChangeListener can be used if an ObservableValue should only maintain a weak reference to the listener. This helps to avoid memory leaks which can occur if observers are not unregistered from observed objects after use.

WeakChangeListener instances are created by passing in the original ChangeListener. The WeakChangeListener should then be registered to listen for changes of the observed object.

Note: You have to keep a reference to the ChangeListener that was passed in for as long as it is in use, otherwise it will be garbage collected too soon.

Since:

JavaFX 2.0

See Also:

ChangeListener, ObservableValue

Constructor Summary

Constructors

Constructor	Description
WeakChangeListener(ChangeListener<T> listener)	The constructor of WeakChangeListener.

Method Summary

Methods declared in interface javafx.beans.value.ChangeListener

changed

Methods declared in class java.lang.Object

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

Methods declared in interface javafx.beans.WeakListener

wasGarbageCollected

Constructor Detail

WeakChangeListener

public WeakChangeListener(ChangeListener<T> listener)

The constructor of WeakChangeListener.

Parameters:

listener - The original listener that should be notified