窗口显示不正确

Question

我在JavaFx上有一个简单的应用程序，只有VBox中的button和TextField。当我启动它时，窗口在右侧显示一个空白区域。我怎么解决这个问题？

public class FxTest extends Application {

    Stage window;
    Scene scene1;

    @Override
    public void start(Stage stage) throws Exception {
        window = stage;
        TextField tf = new TextField();
        Button b = new Button("click");
        b.setOnAction(e -> System.out.println(tf.getText()));

        VBox layout = new VBox();
        layout.getChildren().addAll(tf, b);
        layout.setPadding(new Insets(20));

        scene1 = new Scene(layout, 200, 300);

        window.setScene(scene1);
        window.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}