有人能帮我调整javaFX场景的大小吗

Scene scene = new Scene(root);
scene.setWidth(800);
scene.setHeight(600);

Stage stage = new Stage();
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setResizable(true);

scene.setOnSizeChanged((ObservableValue<? extends Number> observable, Number oldValue, Number newValue) -> {
    double width = newValue.doubleValue();
    double height = newValue.doubleValue();
    scene.setWidth(width);
    scene.setHeight(height);
});

Scene scene = new Scene(root);
scene.setFill(javafx.scene.paint.Color.TRANSPARENT);