作者地址：https://github.com/AlfredTheBest/Design-Pattern * Lesson 0[《设计模式简介》](https://github.com/AlfredTheBest/Design-Pattern/tree/master/lesson0) * Lesson 1 [简单工厂模式](https://github.com/AlfredTheBest/Design-Pattern/tree/master/lesson1) * Lesson 2 [策略模式](https://github.com/AlfredTheBest/Design-Pattern/t