迭代器遍历Set的原理？

Question

Set中对象是无序不可重复的，那么迭代器是怎么实现把游标指向下一个对象的？

Answer 1

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Answer 2

Hashset 它不保证集合的迭代顺序；特别是它不保证该顺序恒久不变

Answer 3

无须是没有大小顺序；就像1，2，3，4,5,6；6,3,1,4,5,2；都是有顺序的，没具体研究过这个，里面可能是指针吧