Hashtable 线程安全的,但效率低 内部有上锁的控制 synchronized Hashmap 线程不安全的,但效率高 ConcurrentHashMap 兼顾了线程安全和效率的问题 分析:HashTable锁了整段数据(用户操作是不同的数据段,依然需要等待) 解决方案:把数据分段,执行分段锁(分离锁... ...
A special “ConcurrentLinkedHashMap(int,float,int,boolean)” constructor is provided to create a concurrent linked hash map whose order of iteration is the order in which its entries were last accessed, from least-recently accessed to most-recently (access-order). This kind of map is well-sui...