转载 UML类图介绍 和 设计模式 类图
http://www.open-open.com/lib/view/open1328059700311.html
http://blog.csdn.net/chen4013874/article/details/51347535
http://www.open-open.com/lib/view/open1328059700311.html
http://blog.csdn.net/chen4013874/article/details/51347535