本文探讨了面向对象设计中的两种核心关系：is-a 和 has-a。is-a 描述了一种继承关系，当一个类是另一个类的一种特例时使用公共继承表达这种关系；has-a 则描述了一种拥有关系，当一个类内部使用另一个类的对象时，通常通过组合或聚合的方式实现。通过具体例子说明了如何区分这两种关系并正确应用。
The simple rule is this:If an object has an is-a relationship to another object,use public inheritance.If a has-a relationship describes the objects best,then use layering. What exactly do the term is-a and has -a mean?Pretty much exactly what they sound like.If we use them in a sentence,the meaning becomes clearer:
Class covette is -a type of class Car.
Class Corvette has-a type class Radio.
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