java上简易MP3播放器工程源码+所需jar，含播放添加歌曲等基本功能（课设作品),环境se1.8，（完善度0.2，毕竟只是一份作业）-Simple MP3 player on java source code+ project required jar, containing the basic functions add songs to play (class-based works), environmental se1.8, (0.2 sophistication, after al