User 8639654 2022-06-24 06:07:19 阅读数:564
what？ Turned out to be HashMap Sheathed ！HashMap Become the ultimate snake skin worker ！
We know HashMap There are keys and values , But in HashSet The median is one , Namely Object
And in the HashMap The middle key will save only one copy , So it won't be repeated .
I want to see others TreeSet：
Solve the case again , Namely TreeMap The upper layer is covered with leather ...
Only this and nothing more , The introduction of the collection class is almost complete , I will also write a heap data structure . Later, it is possible to use things in the collection in the concurrent part ~
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