不积跬步无以至千里

Sequence DiagramsA sequence diagram is a form of interaction diagram which shows objects as lifelines running down the page, with their interactions over time represented as messages drawn as arrows

UML tutorialhttp://www.holub.com/goodies/uml/http://edn.embarcadero.com/article/31863http://www.sparxsystems.com/resources/uml2_tutorial/ UML toolshttp://stackoverflow.com/questions/15376/

[-]转载自软件设计之UMLUML中的六大关系一UML中的六大关系继承关系泛化Generalization实现关系Realization依赖Dependency关联双向关联自身关联聚合Aggregation组合Composition转载自：软件设计之UML—UML中的六大关系一、UML中的六大关系在UML类图中，常见的有以下几

转自：http://blog.youkuaiyun.com/tianhai110/article/details/6339565在UML类图中，常见的有以下几种关系:泛化（Generalization）,  实现（Realization）,关联（Association）,聚合（Aggregation）,组合(Composition)，依赖(Dependency) 1.泛化(Generali