是否可以在运行时将节点添加到HBox？

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class AddNodeToHBoxExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        HBox hbox = new HBox();

        Button button1 = new Button("Button 1");
        Button button2 = new Button("Button 2");

        hbox.getChildren().add(button1);
        hbox.getChildren().add(button2);

        Scene scene = new Scene(hbox, 200, 100);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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