fxml fxml:如何在VBox中创建自制JavaFX的新实例

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.VBox?>

<VBox xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.MyCustomControlController">
    <Label text="Hello, World!" />
</VBox>

package com.example;

import javafx.fxml.FXML;
import javafx.scene.control.Label;

public class MyCustomControlController {
    @FXML
    private Label label;

    public void initialize() {
        label.setText("Hello, FXML!");
    }
}

package com.example;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class MainApp extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("MyCustomControl.fxml"));
        VBox root = loader.load();

        Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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