创建、删除、重命名播放列表。 添加/删除歌曲到播放列表。 显示歌曲元数据（歌手、专辑、时长）。 播放模式：顺序、循环、随机。 技术要点： 使用ArrayList管理歌曲和播放列表。 通过File类读取本地MP3文件的元数据（ID3标签，可使用第三方库如jaudiotagger）。

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