javafx DropShadow

public class EffectTest extends Application {
DropShadow shadow = new DropShadow();
  public static void main(String[] args) {
    launch(args);
  }

  @Override
  public void start(Stage stage) {
    Scene scene = new Scene(new Group());
    stage.setTitle("Button Sample");
    stage.setWidth();
    stage.setHeight();

    VBox vbox = new VBox();
    vbox.setLayoutX();
    vbox.setLayoutY();

    final Button button1 = new Button("Accept");

    button1.addEventHandler(MouseEvent.MOUSE_ENTERED,
        new EventHandler<MouseEvent>() {
          @Override
          public void handle(MouseEvent e) {
            button1.setEffect(shadow);
          }
        });

    button1.addEventHandler(MouseEvent.MOUSE_EXITED,
        new EventHandler<MouseEvent>() {
          @Override
          public void handle(MouseEvent e) {
            button1.setEffect(null);
          }
        });

    vbox.getChildren().add(button1);
    vbox.setSpacing();
    ((Group) scene.getRoot()).getChildren().add(vbox);

    stage.setScene(scene);
    stage.show();
  }

}