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https://issues.apache.org/jira/browse/COLLECTIONS-485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802300#comment-13802300
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Hollis Waite commented on COLLECTIONS-485:
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> I do not know exactly why sorted collections have no wildcard type in
> java.util.Collections
See comments from 10/5. I figured that it's because of the
head/tail/sub-methods (which don't exist for Bag implementations). No big deal
either way.
> Collection copy-constructors should accept wildcarded input
> -----------------------------------------------------------
>
> Key: COLLECTIONS-485
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-485
> Project: Commons Collections
> Issue Type: Improvement
> Components: Bag, BidiMap, Collection, List, Map, Set
> Affects Versions: 4.0-alpha1
> Reporter: Hollis Waite
> Attachments: wildcards.patch
>
>
> Many Collection constructors copy input in order to self-populate. For
> convenience (and consistency with standard Java collections library),
> wildcarded parameters should be accepted where possible. Unmodifiable*
> classes might also benefit from less restrictive generic signatures.
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