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hashtable效率低ConcurrentHashMap 线程安全，效率高 Java 5.0 在 java.util.concurrent 包中提供了多种并发容器类来改进同步容器的性能。 ConcurrentHashMap 同步容器类是Java 5 增加的一个线程安全的哈希表。对与多线程的操作...

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