Spark Shen wrote: > Seems that in new version of JDK, EnumSet<E> and <capture of ? extends > E> (E was previously stated as <E extends Enum<E>>) are not considered > compatible. > After changing > EnumSet<E> set = (EnumSet<E>)collection; > into > EnumSet set = (EnumSet)collection; > , compilation using ant in command line succeeds.
...but gives "unsafe" warnings. > Would any one give a clue, why the are considered incompatible in this > version of JDK? Maybe a bugfix? :) As far as I understand generics, SomeClass<A> and SomeClass<B>, where B extends A, *are* incompatible (per the spec). Generic types are not polymorphic. The problematic line IMO should read: EnumSet<? extends E> set = (EnumSet<? extends E>)collection; That's because collection seems to be an EnumSet of some unknown subclass of E[1] and that connot be safely converted to EnumSet<E>. [1] I guess this is in addAll() or its friends? -KS
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