在面向对象设计中,( )作为完成用例业务的责任承担者,协调、控制其他类共同完成用例规定的功能或行为。
- A.实体类
- B.控制类
- C.边界类
- D.交互类
正确答案及解析
正确答案
解析
类封装了信息和行为,是面向对象的重要组成部分。在面向对象设计中,类可以分为三种类型:实体类、边界类和控制类。①实体类映射需求中的每个实体,实体类保存需要存储在永久存储体中的信息。实体类是对用户来说最有意义的类,通常采用业务领域术语命名,一般来说是一个名词,在用例模型向领域模型转化中,一个参与者一般对应于实体类。②控制类是用于控制用例工作的类,一般是由动宾结构的短语(“动词+名词”或“名词+动词”)转化来的名词。控制类用于对一个或几个用例所特有的控制行为进行建模,控制对象通常控制其他对象,因此它们的行为具有协调性。③边界类用于封装在用例内、外流动的信息或数据流。边界类是一种用于对系统外部环境与其内部运作之间的交互进行建模的类。边界对象将系统与其外部环境的变更隔离开,使这些变更不会对系统其他部分造成影响。
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