Java 的 LinkedHashMap 是否维护键的顺序？
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Does Java's LinkedHashMap maintain the order of keys?
提问by Armand
When LinkedHashMap.keySet() is called, will the order of the Set returned be the same as the order the keys were added in?
调用 LinkedHashMap.keySet() 时，返回的 Set 的顺序是否与添加键的顺序相同？
回答by Tom Tresansky
Yes.
是的。
See: LinkedHashMap:
请参阅：LinkedHashMap：
This linked list defines the iteration ordering, which is normally the order in which keys were inserted into the map (insertion-order).
这个链表定义了迭代顺序，这通常是键被插入到映射中的顺序（插入顺序）。
and from the HashMap#keySetdocumentation:
来自HashMap#keySet文档：
The set [returned] is backed by the map, so changes to the map are reflected in the set, and vice-versa.
set [returned] 由 map 支持，因此对 map 的更改会反映在 set 中，反之亦然。
