HashSet学习:
HashMap和HashTable及HashSet的区别:
http://www.blogjava.net/fisher/archive/2006/12/13/87398.html
Java中HashSet详解:
http://alex09.iteye.com/blog/539549
比较分析Vector、ArrayList和HashTable HaspMap数据结构 :
http://blog.csdn.net/lhooouuu/article/details/6116174
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