java - Java 的 LinkedHashMap 是否维护键的顺序？

Question

这个问题在这里已经有了答案:

Is the order guaranteed for the return of keys and values from a LinkedHashMap object? (5 个回答)

关闭 7 年前.

调用LinkedHashMap.keySet()时，返回Set的顺序会和key的添加顺序一致吗？

Answer 1

是的。

见:LinkedHashMap :

This linked list defines the iteration ordering, which is normally the order in which keys were inserted into the map (insertion-order).

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.