013--集合详解之Map+面试题
集合详解之Map+面试题集合有两个大接口:Collection和Map,本文重点来讲解集合中另一个常用的集合类型Map。以下是Map的继承关系图:11Map简介Map常用的实现类如下:•Hashtable:Java早期提供的一个哈希表实现,它是线程安全的,不支持null键和值,因为它的性能不如ConcurrentHashMap,所以很少被推荐使用。•HashMap:最常用的哈希表实现,如果程序中没有多线程的需求,HashMap是一个很好的选择,支持null键和值,如果在多线程中可用ConcurrentHashMap替代。•TreeMap:基于红黑树的一种提供顺序访问的Map,自身实现了key的...
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