通过控制台程序实现了一个MP3播放器，可以实现歌曲列表显示，歌曲播放，快进快退，音量加减，上一曲下一曲等操作-Through the console program implements a MP3 player, you can realize the song list shows, songs, play, fast forward, rewind, volume addition and subtraction, and other operations on a lower one