如何使用子元素的变量名获取StackPane的子元素

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

public class StackPaneExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        StackPane stackPane = new StackPane();

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

        stackPane.getChildren().addAll(button1, button2);

        Button retrievedButton = (Button) stackPane.lookup("#button1");
        System.out.println(retrievedButton.getText()); // 输出 "Button 1"

        primaryStage.setScene(new Scene(stackPane, 200, 200));
        primaryStage.show();
    }

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