Krzysztof Sobolewski 写道:
Spark Shen wrote:
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;
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.
That's odd. I used a compiler this time and could not reproduce it (with
javac 1.5.0_08-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? :)
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
It always gives you "unchecked cast" warning, no errors.
Best regards
And I did not find a way to suppress the unchecked warning while
compilation succeed.
Maybe @SuppressWarnings("unchecked")? If you're absolutely sure it's OK...
BTW:
EnumSet<?> set = (EnumSet<?>)collection;
seems to compile fine, but I'm not sure it's enough for you :)
[1] I guess this is in addAll() or its friends?
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.
Oh, yeah... Who'd remember all that... ;)
-KS
--
Spark Shen
China Software Development Lab, IBM
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