如何在 HashMap 中保留插入顺序? [英] How to preserve insertion order in HashMap?

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?

解决方案

LinkedHashMap 正是您要找的.

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?

解决方案

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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