Java中有序集的任何实现?

I've heard there is a collection called LinkedHashMap, but I haven't found anything like it for a set.

推荐答案

看看LinkedHashSet 类

来自 Java 文档:

From Java doc:

Set 接口的哈希表和链表实现，具有可预测的迭代顺序.此实现与 HashSet 的不同之处在于它维护一个双向链表，该列表贯穿其所有条目.这个链表定义了迭代顺序，元素被插入到集合中的顺序(insertion-order).请注意，如果将元素重新插入集合中，插入顺序不会受到影响.(如果在调用 s.contains(e) 将在调用之前立即返回 true 时调用 s.add(e)，则元素 e 将重新插入到集合 s 中.).

Hash table and linked list implementation of the Set interface, with predictable iteration order. This implementation differs from HashSet in that it maintains a doubly-linked list running through all of its entries. This linked list defines the iteration ordering, which is the order in which elements were inserted into the set (insertion-order). Note that insertion order is not affected if an element is re-inserted into the set. (An element e is reinserted into a set s if s.add(e) is invoked when s.contains(e) would return true immediately prior to the invocation.).

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