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HashSet和TreeSet的区别-奔跑吧爽爽的博客-51CTO博客
source link: http://blog.51cto.com/13579086/2069837
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HashSet无序（存入和取出的顺序不同），不重复，无索引底层是哈希表结构，也称散列表结构，查找和删除快，添加慢像HashSet中存储自定义对象需要重写hashCode（）和equals()方法importjava.util.HashSet;importjava.util.Iterator;/***演示HashSet是如何保证元素的唯一性的*@authorWangShuang**/publiccl
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