如何在javafx中获取元数据值？

Question

我想知道以下代码为什么不起作用。我尝试根据文件的元数据值创建两个ArrayList<String>。在这种情况下，.mp3个文件。

private Stage stage;
private List<File> filelist;
private Map<String, Object> map;
private ArrayList<String> artist;
private ArrayList<String> title;    

public void open(){
    FileChooser chooser = new FileChooser();
    filelist = chooser.showOpenMultipleDialog(stage);
    for (int i = 0; i <= filelist.size(); i++){
        try {
            Media media = new Media(filelist.get(i).toURI().toURL().toString());
            map = media.getMetadata();
            title.add(map.get("title").toString());
            artist.add(map.get("artist").toString());
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
    }
}

public void test(){
    for (int i = 0; i <= filelist.size(); i++){
    System.out.println(filelist.get(i).getName());
    System.out.println(title.get(i));
    System.out.println(artist.get(i));
    }
}

当我尝试打印艺术家和标题中的值时，会出现错误