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                ### ConcurrentHashMap在JDK 7和8之間的區別 * JDK1.8的實現降低鎖的粒度,JDK1.7版本鎖的粒度是基于Segment的,包含多個HashEntry,而JDK1.8鎖的粒度就是HashEntry(首節點) * JDK1.8版本的數據結構變得更加簡單,使得操作也更加清晰流暢,因為已經使用synchronized來進行同步,所以不需要分段鎖的概念,也就不需要Segment這種數據結構了,由于粒度的降低,實現的復雜度也增加了 * JDK1.8使用紅黑樹來優化鏈表,基于長度很長的鏈表的遍歷是一個很漫長的過程,而紅黑樹的遍歷效率是很快的
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