August 2021
Intermediate to advanced
450 pages
4h 46m
Chinese
Content preview from 面向对象的思考过程（原书第5版）
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12.1.4 ISP：接口隔离原则
接口隔离原则（ISP）指出，拥有许多小型接口要比拥有一些大型接口更好。
在此示例中，我们将创建一个接口，其中包含Mammal的多个行为，比如eat()和makeNoise()：
与其为Mammal创建单个接口，不如为所有的行为创建单独的接口：
实际上，我们正在将Mammal类的行为解耦。因此，我们不是通过继承（实际上是接口）创建单个Mammal实体，而是转向基于组合的设计，类似上一章中所采用的策略。
简而言之，通过使用这种方法，我们可以构建具有组合部分的Mammal，而不是被迫利用单个Mammal类中包含的行为。例如，假设有人发现一只Mammal不吃东西，而是通过皮肤吸收营养，如果我们从包含eat()行为的单个Mammal类继承，则新的哺乳动物将不需要这种行为。但是，如果我们将所有行为分成独立的单个接口，则可以按照其自身呈现的方式来构建每种哺乳动物。
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