如何在此java代码中添加再次播放选项？

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.stage.Stage;

public class MediaPlayerExample extends Application {
    private MediaPlayer mediaPlayer;

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

    @Override
    public void start(Stage primaryStage) {
        // 创建媒体文件
        String mediaUrl = "path/to/media/file.mp4";
        Media media = new Media(mediaUrl);

        // 创建媒体播放器
        mediaPlayer = new MediaPlayer(media);

        // 创建再次播放按钮
        Button replayButton = new Button("再次播放");
        replayButton.setOnAction(event -> replayMedia());

        // 创建布局并添加按钮
        VBox root = new VBox(replayButton);

        // 创建场景并显示
        Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void replayMedia() {
        // 重新播放媒体文件
        mediaPlayer.seek(mediaPlayer.getStartTime());
        mediaPlayer.play();
    }
}