HashSet和LinkedHashSet有什么区别 [英] what's the difference between HashSet and LinkedHashSet

问题描述

我看到LinkedHashSet扩展了HashSet，并且我知道它保留了顺序.
但是，从检查JDK中的代码来看，LinkedHashSet似乎仅包含构造函数，没有实现，因此我猜所有逻辑都发生在HashSet中?
如果正确的话，为什么要这样设计?似乎很令人困惑.

I saw that LinkedHashSet extends HashSet and I know it preserves order.
However, from checking the code in the JDK it seems that LinkedHashSet contains only constuctor and no implementation, so I guess all the logic happens in HashSet?
If that is correct, why is it designed like that? it seems very confusing.

该问题中有一个不幸的错误.我写了HashMap和LinkedHashMap而不是HashSet和LinkedHashSet.我已解决问题，如果可能的话，请回答.
另外，我对Java设计师为什么选择像这样实现它感兴趣.

there was an unfortunate mistake in the question. I wrote HashMap and LinkedHashMap instead of HashSet and LinkedHashSet. I fixed the question answer it if possible.
Also, I was interested why Java designers chose to implement it like that.

推荐答案

是的，LinkedHashMap调用了其超级构造函数.它要做的一件事就是重写由超级构造函数调用的init()方法.

Yes, LinkedHashMap calls its super constructor. One thing it does is to override the init() method, which is called by the super constructor.

LinkedHashMap是HashMap，其中添加了双向链接列表实现.

The LinkedHashMap is an HashMap with a doubly-linked list implementation added.

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