摘要: Provide an interface for creating families of related or dependent objects without specifying their concrete classes.为创建一组相关或相互依赖的对象提供一个接口,而且无需指定他们的具体 阅读全文
posted @ 2016-09-01 16:42 leestar54 阅读(215) 评论(0) 推荐(0) 编辑