WeakListener (JavaFX 8)

JavaFX on JDK 8 has a shorter support timeline than JDK 8. Update releases of JDK 8 after March 2028 will not include JavaFX. Visit www.oracle.com/javase/javafx for details.

All Known Implementing Classes:

WeakChangeListener, WeakInvalidationListener, WeakListChangeListener, WeakMapChangeListener, WeakSetChangeListener
```
public interface WeakListener
```
WeakListener is the super interface of all weak listener implementations JavaFX runtime. Usually it should not be used directly, but instead one of the sub-interfaces will be used.

Since:

JavaFX 2.1

See Also:

WeakInvalidationListener, WeakChangeListener

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method and Description
  
  boolean wasGarbageCollected()
  Returns true if the linked listener was garbage-collected.

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`boolean`	`wasGarbageCollected()` Returns `true` if the linked listener was garbage-collected.

- Method Detail
  - wasGarbageCollected
```
boolean wasGarbageCollected()
```
    Returns true if the linked listener was garbage-collected. In this case, the listener can be removed from the observable.
    
    Returns:
    
    true if the linked listener was garbage-collected.

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 2008, 2026, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

Interface WeakListener

Method Summary

Method Detail

wasGarbageCollected