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https://issues.apache.org/jira/browse/COLLECTIONS-502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13828167#comment-13828167
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Thomas Neidhart commented on COLLECTIONS-502:
---------------------------------------------
* BagUtils.EMPTY_BAG
* BagUtils.EMPTY_SORTED_BAG
* IteratorUtils.EMPTY*
* QueueUtils.EMPTY_QUEUE
* SetUtils.EMPTY_SORTED_SET
StringValueTransformer.INSTANCE made private as the second type is fixed to
String.
> Generic parameter inconsistency on various INSTANCE fields
> ----------------------------------------------------------
>
> Key: COLLECTIONS-502
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-502
> Project: Commons Collections
> Issue Type: Improvement
> Components: Functor
> Affects Versions: 4.0
> Reporter: Emmanuel Bourg
> Priority: Trivial
>
> In {{FalsePredicate}} the {{INSTANCE}} singleton is defined as
> {{Predicate<Object>}}. In other predicates such as {{TruePredicate}} it's
> defined as {{Predicate<?>}}. In both cases this prevents the declaration of:
> {code}
> Predicate<Foo> predicate = FalsePredicate.INSTANCE;
> {code}
> This will fail to compile.
> I suggest declaring the INSTANCE fields as an ungenerified {{Predicate}},
> such that the above example compiles with an unchecked warning.
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