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Hashapjdk 1.8前数组链表,1.8后数组链表红黑树。

节点结构:keyvaluenext(在链表中使用)hash(不是key的值,而是key hashcode的新值,高16位,低16位,这样可以更好的哈希)




PUT: 1,表未初始化。由2计算的插槽位置中没有值3。3计算的槽是链表4,槽是红黑树。



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