需要一个具有多个键的Java映射/表到一个值。价值通常被改变 [英] Need a Java map/table with multiple keys to one value. Value is commonly altered

问题描述

我需要的是一个允许多个键访问单个对象的集合。

What I need is a collection which allows multiple keys to access a single object.

我需要对此对象应用频繁的修改。

I need to apply frequent alterations to this object.

对于500k +条目，它也必须有效。

It also must be efficient for 500k+ entries.

推荐答案

c> java.util.Map< K，V> 将这样做 - 对于可以在单独键下添加特定值的次数有无限制 p>

Any implementation of java.util.Map<K,V> will do this - there is no restriction on how many times a particular value can be added under separate keys:

Map<String,Integer> m = new HashMap<String, Integer>();
m.put("Hello", 5);
m.put("World", 5);
System.out.println(m); // { Hello->5, World->5 }  

单个键与多个值相关联，这称为一个多地图，您可以从 google java集合API 或从 Apache的公共集合

If you want a map where a single key is associated with multiple values, this is called a multi-map and you can get one from the google java collections API or from Apache's commons-collections

这篇关于需要一个具有多个键的Java映射/表到一个值。价值通常被改变的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！