How to preserve insertion order in HashMap?(如何在 HashMap 中保留插入顺序?)
问题描述
我正在使用 HashMap
.当我遍历地图时,数据以(通常相同的)随机顺序返回.但是数据是按特定顺序插入的,我需要保留插入顺序.我该怎么做?
LinkedHashMap
正是您要找的.p>
它和 HashMap
完全一样,只是当你迭代它时,它会按照插入顺序呈现项目.
I'm using a HashMap
. When I iterate over the map, the data is returned in (often the same) random order. But the data was inserted in a specific order, and I need to preserve the insertion order. How can I do this?
LinkedHashMap
is precisely what you're looking for.
It is exactly like HashMap
, except that when you iterate over it, it presents the items in the insertion order.
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