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HashMap 和 Hashtable 的区别补充 #2395
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在 Java 集合(下)中,讲到了HashMap 和 Hashtable 的区别,可以再增加一点:
哈希值使用:HashTable 直接使用对象的 hashCode,而 HashMap 重新计算 hash 值(二次哈希)。
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