Java集合类 [英] Java collection classes

问题描述

Collection类HashSet扩展了AbstractSet类.它还实现了Set接口.
但是，由于AbstractSet类已经实现了Set接口，那么为什么需要HashSet再次实现它呢? HashSet以不同的方式实现它.接口保持不变，实现更改，因为HashSet功能不同.对基类的某些接口方法的这种重新实现是接口实现的一种常见技术.

—SA

The Collection class HashSet extends the AbstractSet class . Also it implements the Set interface.
But as the AbstractSet class already implements Set interface, then why there is a need for HashSet to implement it again ?

解决方案

Nothing wrong here; HashSet implements it in a different way. Interface remains the same, implementation changes, because HashSet features are different. Such re-implementation of some interface methods of base class is quite a usual technique of interface implementation.

—SA

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