如何在睡眠后刷新两次JavaFX屏幕？

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

public class MainApp extends Application {

    private static final int REFRESH_COUNT = 2;

    @Override
    public void start(Stage primaryStage) {
        Label label = new Label("Hello, JavaFX!");
        StackPane root = new StackPane(label);
        Scene scene = new Scene(root, 400, 300);

        primaryStage.setScene(scene);
        primaryStage.show();

        // 在睡眠后刷新屏幕
        refreshScreen(label);
    }

    private void refreshScreen(Label label) {
        new Thread(() -> {
            try {
                Thread.sleep(1000); // 等待1秒
                updateLabelText(label, "First Refresh");
                Thread.sleep(1000); // 等待1秒
                updateLabelText(label, "Second Refresh");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();
    }

    private void updateLabelText(Label label, String text) {
        // 在JavaFX的应用线程中更新UI
        Platform.runLater(() -> label.setText(text));
    }

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