有没有一种方法可以在数组中加载多个fxml，然后在按钮被按下的情况下显示其中一个，而不需要在javaFX中重新加载相同的fxml？

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

import java.io.IOException;

public class Main extends Application {
    private Pane container;
    private Button button1;
    private Button button2;

    @Override
    public void start(Stage primaryStage) throws Exception {
        container = new Pane();
        button1 = new Button("Load FXML 1");
        button1.setOnAction(event -> loadFXML("FXML1.fxml"));
        button2 = new Button("Load FXML 2");
        button2.setOnAction(event -> loadFXML("FXML2.fxml"));

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

        Scene scene = new Scene(container);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void loadFXML(String fxmlFileName) {
        container.getChildren().clear(); // 清空容器中的子节点

        try {
            FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource(fxmlFileName));
            container.getChildren().add(fxmlLoader.load()); // 加载FXML文件并添加到容器中
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

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