java 我需要一个保留插入顺序的不可变键值结构
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I need an immutable key-value structure that retains insertion order
提问by Oleksandr Karaberov
I want to find something like ImmutableLinkedHashMap<>in Guava library.
I need to use an immutable key-value data structure with an insertion order.
So, what should I use?
我想ImmutableLinkedHashMap<>在番石榴图书馆中找到类似的东西。我需要使用具有插入顺序的不可变键值数据结构。那么，我应该使用什么？
回答by mdm
I am not sure I am understanding exactly what you are after, but if it is a really immutable Map, you mght want to look at ImmutableMap
我不确定我是否完全理解你所追求的，但如果它真的是不可变的Map，你可能想看看ImmutableMap
As mentioned in the doc:
如文档中所述：
An immutable, hash-based
Mapwith reliable user-specified iteration order. Does not permit null keys or values.Unlike
Collections.unmodifiableMap(java.util.Map<? extends K, ? extends V>), which is a view of a separate map which can still change, an instance ofImmutableMapcontains its own data and will never change.ImmutableMapis convenient forpublic static finalmaps ("constant maps") and also lets you easily make a "defensive copy" of a map provided to your class by a caller
一个不可变的，基于哈希的，
Map具有可靠的用户指定的迭代顺序。不允许空键或值。与
Collections.unmodifiableMap(java.util.Map<? extends K, ? extends V>)是一个仍然可以改变的单独地图的视图不同， 的实例ImmutableMap包含它自己的数据并且永远不会改变。ImmutableMap对于public static final地图（“常量地图”）很方便，还可以让您轻松制作由调用者提供给您的班级的地图的“防御副本”
E.g, you could use it in a similar fashion:
例如，您可以以类似的方式使用它：
Map<Integer, String> m = ImmutableMap.of(5,"Five",6,"Six",7,"Seven");
Hope this is what you were after.
希望这就是你所追求的。
回答by dogbane
First create a LinkedHashMapand then use ImmutableMap.copyOf(linkedHashMap)to create an immutable copy which will have the same ordering as the original map.
首先创建一个LinkedHashMap，然后用于ImmutableMap.copyOf(linkedHashMap)创建一个与原始地图具有相同顺序的不可变副本。
