Module javafx.base
Package javafx.collections

## Interface SetChangeListener<E>

- Type Parameters:
    `E` - the element type
  All Known Implementing Classes:
    `WeakSetChangeListener`
  Functional Interface:
    This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

      @FunctionalInterface
      public interface SetChangeListener<E>

  Interface that receives notifications of changes to an ObservableSet.
  Since:
    JavaFX 2.1

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface | Description
    --- | --- | ---
    `static class` | `SetChangeListener.Change<E>` | An elementary change done to an ObservableSet.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `onChanged​(SetChangeListener.Change<? extends E> change)` | Called after a change has been made to an ObservableSet.

- - ### Method Detail

    - #### onChanged

          void onChanged​(SetChangeListener.Change<? extends E> change)

      Called after a change has been made to an ObservableSet. This method is called on every elementary change (add/remove) once. This means, complex changes like removeAll(Collection) or clear() may result in more than one call of onChanged method.
      Parameters:
        `change` - the change that was made