How to avoid items being re-ordered when put into java HashMap(放入java HashMap时如何避免重新排序项目)
问题描述
我正在创建一个新地图并将字符串推入其中(没什么大不了的)-但我注意到随着地图的增长,字符串正在重新排序.是否可以停止这种重新排序,以便地图中的项目保留放置时的顺序?
I'm creating a new Map and pushing strings into it (no big deal) -but I've noticed that the strings are being re-ordered as the map grows. Is it possible to stop this re-ordering that occurs so the items in the map retain the order the were put in with?
推荐答案
如果您关心订单,可以使用 SortedMap
.实现接口的实际类(至少在大多数情况下)是 树图
.或者,LinkedHashMap
也维护它的顺序,同时仍然使用基于哈希表的容器.
If you care about order, you can use a SortedMap
. The actual class which implements the interface (at least for most scenarios) is a TreeMap
. Alternatively, LinkedHashMap
also maintains its order, while still utilizing a hashtable-based container.
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