Question

i recently bumps into this code below when exploring javafx, i see that ObservableList is an interface and there is no implementation of it, how can you use a variable of it ? obvious i am missing something here, can anyone point me to right direction?

    List list = new ArrayList();

    ObservableList observableList = FXCollections.observableList(list);
    observableList.addListener(new ListChangeListener() {
        @Override
        public void onChanged(ListChangeListener.Change change) {
            System.out.println("Detected a change! ");
        }
    });

Answer 1

I think this code:

FXCollections.observableList(list);

means this method get a implementation of the interface, you can download the source to check it.