我的菜单栏不在 window 的顶部？

Question

Hello I want to up my menuBar on the top of the window like all sofware?

This is the code:

    @Override
    public void start(Stage primaryStage) throws Exception{

        Image image = new Image("GUI/Images/grass_block_side.png");
        ImageView imageView = new ImageView(image);
        imageView.setPreserveRatio(true);
        imageView.setFitHeight(128);
        FlowPane root = new FlowPane();
        Button btnConvert = new Button("Convert=>");
        MenuBar menuBar = new MenuBar();
        menuBar.setUseSystemMenuBar(true);
        Menu fichier = new Menu("Fichier");
        menuBar.getMenus().add(fichier);
        ListView<Material> ListViewMateriel = new ListView<>();
        ObservableList<Material> items = FXCollections.observableArrayList ();
        ListViewMateriel.setItems(items);
        root.getChildren().addAll(imageView,menuBar,btnConvert,ListViewMateriel);
        root.setPadding(new Insets(15,15,15,15));
        root.setHgap(10);
        root.setVgap(20);

Answer 1

If I could recommend using Scene Builder, everything is done there with such ease it's ridiculous. There you could anchor it to the top, left, and right, and that would do the trick. Just a recommendation