A ChangeListener is notified whenever the value of an ObservableValue changes. It can be registered and unregistered with ObservableValue.addListener(ChangeListener) respectively ObservableValue.removeListener(ChangeListener)

For an in-depth explanation of change events and how they differ from invalidation events, see the documentation of ObservableValue.

The same instance of ChangeListener can be registered to listen to multiple ObservableValues.