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https://issues.apache.org/jira/browse/COLLECTIONS-301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Yandell closed COLLECTIONS-301.
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Resolution: Won't Fix
It's nothing to do with Map, it's a JVM feature. Primitive wrappers and Strings
are, to some extent, pooled in the JVM.
For String's the feature is called 'interning', as it can be forced with a call
to String.intern(). I'm not sure what the state of things is with the primitive
wrappers.
> Provide SingleValueMap
> ----------------------
>
> Key: COLLECTIONS-301
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-301
> Project: Commons Collections
> Issue Type: New Feature
> Components: Map
> Affects Versions: 3.2
> Reporter: Michael
>
> I miss an efficient implementation of a SingleValueMap.
> The idea goes as follows:
> Map<String, String> map = new SingleValueMap<String, String>();
> map.put("hello","greeting");
> map.put("hola","greeting");
> map.put("hallo",greeting");
> a normal map would now hold three copies of "greeting". A SingleValueMap
> would contain only one copy of this value. All keys would map to one copy,
> identically to a N:1 relaton.
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