Null Object Design Pattern
摘要：
From: http://www.cs.oberlin.edu/~jwalker/nullObjPattern/Null Object Pattern Intent Provide an object as a surrogate for the lack of an object of a given type. The Null Object provides intelligent do... 阅读全文
posted @ 2006-12-06 19:56 flyingchen 阅读(1164) 评论(0) 推荐(0) 编辑