SOLID原则：http://www.cnblogs.com/lanxuezaipiao/archive/2013/06/09/3128665.html
https://www.cnblogs.com/adam/category/85782.html
https://www.cnblogs.com/zhenyulu/category/6930.html
http://www.cnblogs.com/shaosks/category/351488.html
原文：https://www.cnblogs.com/marblemm/p/9356708.html