我似乎无法让RadioButton在JavaFX中工作

Question

I can't seem to get this block of code to work for RadioButtons. It keeps on giving me an error for the new ChangeListener, the error being "The type ChangeListener is not generic; it cannot be parameterized with arguments ". However I can't find any examples which isn't like mine below.

group.selectedToggleProperty().addListener(new ChangeListener<Toggle>() {
    public void changed(ObservableValue<? extends Toggle> ov, Toggle old_toggle, Toggle new_toggle) {
        if (patrolBut.isSelected()) {
            placeShipVert(patrolBoat, r, playerBoard, shapes);
        } else if (destroyerBut.isSelected()) {
            placeShipVert(destroyer, r, playerBoard, shapes);
        }
    }
});

Thanks for any help.

Answer 1

Like in the comment above, have you imported the correct ChangeListener ? Depending on your IDE (eg Eclipse) you can set your errors and warnings on having to add a @Override annotation to your methods if they override a method. As you think you will have overriden a method (and thus added a @Override) the IDE would have warned you that in fact you didn't.

If you use Java 8, I personally use change listeners as a Lambda: foo.addListener( (v, o, n) -> handleNewValue(n));