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HashTable 的 Java 实现

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  •   Powered Oct 25, 2016 2342 views
    This topic created in 3471 days ago, the information mentioned may be changed or developed.
    http://www.cnblogs.com/goodwin/p/4102702.html

    HashTable在java中

    计算hash(key)得到index索引

    那么是把value放在一个数组中,index作索引

    还是把key-value对放在对应的bucket中?
    4 replies    2016-10-25 09:51:08 +08:00
    SoloCompany
        1
    SoloCompany  
       Oct 25, 2016
    不管是什么实现 Bucket 当然需要存 key pair 了
    否则,先不谈遍历,你 put 的时候怎么知道是否发生了 collision
    Powered
        2
    Powered  
    OP
       Oct 25, 2016 via Android
    @SoloCompany
    所以是, bucket 中存 entry 对象, hash(key)得到的 index 是 bucket 的索引吗
    SoloCompany
        3
    SoloCompany  
       Oct 25, 2016
    @Powered bucket 可以放一个链表,或者数组,因为你不能忽略 collision
    cloud107202
        4
    cloud107202  
       Oct 25, 2016
    一般 bucket 中是个 entry 链表, hash(key1)得到 bucket 的 index ,然后遍历链表,比对 key1 与链表每个 entry 对象的 key 。如果 hash 函数设计良好,元素均匀的分散在各个 bucket 中, entry 链表的遍历开销可认为是 O(1)
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