关于Java String, StringBuilder, StringBuffer, Hashtable, HashMap的面试题(二)
synchronization is not an issue for you, I'd recommend HashMap. If synchronization becomes an issue, you may also look at ConcurrentHashMap.
总之都是unsynchronized要快一些，但鉴于Hashtable这个概念在面试中比HashMap来的多得多，所以在做面试题时还是用Hashtable吧，在项目开发中我从来都是用HashMap.