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Date: Mon, 28 Aug 2006 20:48:39 +0800
From: Spark Shen <smallsmallorgan@gmail.com>
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To: harmony-dev@incubator.apache.org
Subject: Re: [classlib] Sun compiler change?
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Krzysztof Sobolewski =E5=86=99=E9=81=93:
> Spark Shen wrote:
>
>  =20
>>> 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 =3D (EnumSet<? extends E>)collection;
>>>  =20
>>>      =20
>> Do you mean to change the problematic line into the above statement? I
>> have tried this already, but this type of cast will also give a
>> compilation error.
>>    =20
>
> That's odd. I used a compiler this time and could not reproduce it (with
> javac 1.5.0=5F08-b03 and quick-and-dirty from-the-scratch EnumSet impl). =
It
> always gives me "unchecked cast" warning, no errors. Maybe I should check
> out Harmony sources? :)
>  =20
Did you (refer to thread [app] ant with ecj) put

Eclipse compiler JAR on Ant's
execution classpath to execute the javac task.

If so, may be that's why=20
It always gives you "unchecked cast" warning, no errors.

Best regards

>  =20
>> And I did not find a way to suppress the unchecked warning while
>> compilation succeed.
>>    =20
>
> Maybe @SuppressWarnings("unchecked")? If you're absolutely sure it's OK...
>
> BTW:
> EnumSet<?> set =3D (EnumSet<?>)collection;
> seems to compile fine, but I'm not sure it's enough for you :)
>
>  =20
>>> [1] I guess this is in addAll() or its friends?
>>>  =20
>>>      =20
>> I guess 'its friends' refers to removeAll, containsAll, and retainAll.
>> :-)   But all its friends have different signature as addAll
>>
>> boolean     addAll(*Collection<? extends E>* c)
>> boolean     containsAll(*Collection<?>* c)
>> boolean     removeAll(*Collection<?>* c)
>> boolean     retainAll(*Collection<?>* c)
>> I guess you know why they are different.
>>
>> So, in the implementation of all its friends, same problem is not
>> encountered.
>>    =20
>
> Oh, yeah... Who'd remember all that... ;)
> -KS
>
>  =20


--=20
Spark Shen
China Software Development Lab, IBM


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