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https://issues.apache.org/jira/browse/COLLECTIONS-461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13656488#comment-13656488
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Matt Benson commented on COLLECTIONS-461:
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Yes, but you didn't transform the keys and/or values to different *types*. ;)
> splitmap.TransformedMap is not really a Map
> -------------------------------------------
>
> Key: COLLECTIONS-461
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-461
> Project: Commons Collections
> Issue Type: Bug
> Reporter: Sebb
> Fix For: 4.x
>
>
> splitmap.TransformedMap is part of the Get/Put hierarchy, but it does not
> behave like a proper Java Map.
> In particular, java.util.Map.put(K, V) returns V.
> However the collections Put interface returns Object.
> As far as I can tell, this was done in order to be able to include
> TransformedMap in the hiearchy. But the side effect is to break the generics
> for all the non-transformer maps in the hierarchy.
> Maybe there should be a separate PutTransformed interface which has the
> appropriate generic types, i.e.
> public T put(K key, V value)
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