- Type Parameters:
T- The type of the observed value
public final class WeakChangeListener<T> extends Object implements ChangeListener<T>, WeakListener
WeakChangeListenercan be used if an
ObservableValueshould 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
WeakChangeListener should then be
registered to listen for changes of the observed object.
Note: You have to keep a reference to the
was passed in for as long as it is in use, otherwise it will be garbage collected
WeakChangeListenerThe constructor of
listener- The original listener that should be notified
wasGarbageCollectedpublic boolean wasGarbageCollected()Returns
trueif the linked listener was garbage-collected. In this case, the listener can be removed from the observable.
changedCalled when the value of an
In general, it is considered bad practice to modify the observed value in this method.