javafx.beans (JavaFX 17)

Module javafx.base

# Package javafx.beans

The package `javafx.beans` contains the interfaces that define the most generic form of observability. All other classes in the JavaFX library, that are observable, extend the `Observable` interface.

An implementation of `Observable` allows to attach an `InvalidationListener`. The contentBinding gets notified every time the `Observable` may have changed. Typical implementations of `Observable` are all properties, all bindings, `ObservableList`, and `ObservableMap`.

An `InvalidationListener` will get no further information, e.g. it will not get the old and the new value of a property. If you need more information consider using a `ChangeListener` for properties and bindings, `ListChangeListener` for `ObservableLists` or `MapChangeListener` for `ObservableMap` instead.

- Interface Summary
  Interface | Description
  --- | ---
  InvalidationListener | An `InvalidationListener` is notified whenever an `Observable` becomes invalid.
  Observable | An `Observable` is an entity that wraps content and allows to observe the content for invalidations.
  WeakListener | `WeakListener` is the super interface of all weak listener implementations in the JavaFX API.

- Class Summary
  Class | Description
  --- | ---
  WeakInvalidationListener | A `WeakInvalidationListener` can be used if an `Observable` should only maintain a weak reference to the listener.

- Annotation Types Summary
  Annotation Type | Description
  --- | ---
  DefaultProperty | Specifies a property to which child elements will be added or set when an explicit property is not given.
  NamedArg | Annotation that provides information about argument's name.