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https://issues.apache.org/jira/browse/COLLECTIONS-333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764001#comment-13764001
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Thomas Neidhart commented on COLLECTIONS-333:
---------------------------------------------

It is still possible, but only when you use the raw version of the class 
without generics.
This should probably mentioned in the class javadoc of each of the Transformed* 
classes.
                
> Generic versions of Transformed* classes
> ----------------------------------------
>
>                 Key: COLLECTIONS-333
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-333
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: Bag, Collection, List, Set
>    Affects Versions: 3.2
>         Environment: OS X
>            Reporter: Edwin Tellman
>            Priority: Minor
>
> The generic version of Transformer required the input and output types to be 
> identical.  This seemed to me to reduce the usefulness of transformed 
> collections, as transforming one type into another seems like it would be a 
> fairly common operation.  I'm not sure how to fix this, however, as it also 
> doesn't seem feasible to have a generic TransformedCollection with different 
> input and output types that implements Collection<E>.  Anyway, this patch 
> de-generifies TransformedCollection, which also fixes some compilation 
> problems.  Please disregard this change if you disagree and have a better 
> solution.
> Cloned from COLLECTIONS-243, where there is much Transformed* discussion.

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