IDEA快捷键整理
http://blog.csdn.net/xuanze520/article/details/6773976
浅析java中的final关键字
http://www.cnblogs.com/dolphin0520/p/3736238.html
Java enum的用法详解
http://www.cnblogs.com/happyPawpaw/archive/2013/04/09/3009553.html
原文：http://www.cnblogs.com/imax0316/p/5125329.html