摘要: ★★★★★ 定义对象间的一种一对多的依赖关系,以便当一个对象的状态发生改变时,所有依赖于它的对象都得到通知并自动更新。 Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. 阅读全文
posted @ 2007-09-20 11:10 sekihin 阅读(604) 评论(0) 推荐(3) 编辑