UML基本架构建模－－关联概述

Relationships

关联

When you build abstractions, you’ll discover that very few of your classes stand alone. Instead, most of them collaborate with others in a number of ways. Therefore, when you model a system, not only must you identify the things that form the vocabulary of your system, you must also model how these things stand in relation to one another.

在你构建抽象事物的时候，将会发现你的类很少独立存在．取而代之的是它们中的大多数有很多方式与其它的类交互．因此，当你为某个系统建模时，不仅要从你的系统词汇表中识别事物，还要为这些事物之间的关联建模．

In object-oriented modeling, there are three kinds of relationships that are especially important: 
dependencies,which represent using relationships among classes (including refinement, trace, and bind relationships ); generalizations, which link generalized classes to their specializations; and associations, which represent structural relationships among objects. Each of these relationships provides a different way of combining your abstractions.

在面向对象建模里，有三类关联特别重要：依赖，它代表的是类之间的使用关系(包括完善，跟踪和绑定关系)；通用，将广义类专门化；聚合，代表对象之间的结构关系．这些关联为抽象事物提供了不同的连接方式．

Building webs of relationships is not unlike creating a balanced distribution of responsibilities among your classes. Over-engineer, and you’ll end
up with a tangled mess of relationships that make your model  incomprehensible, under-engineer, and you’ll have missed a lot of the richness of your system embodied  in the way things collaborate.

给关联网建模不同于在类之间创建平衡的职责分配．多余的设计使得关系犹如一团乱麻般，使你的模型难于理解；设计不足你又会错过很多富于表现系统交互的方式．

时间： 2024-10-12 09:20:20

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