Date: Fri, 26 Dec 2008 20:07:16 +0200 From: "Vladimir Tsvetkov" <npacemo@gmail.com> To: "Frank Staals" <frankstaals@gmx.net> Cc: questions@freebsd.org Subject: Re: Off-topic: Java Reflection/Generics/Collections question Message-ID: <666bdb140812261007p21b23e13k48d80e4a454ce49e@mail.gmail.com> In-Reply-To: <4954E849.6020000@gmx.net> References: <4954E849.6020000@gmx.net>
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What you try to do is not a valid operation in type-safe language as Java. You can't convert Coll to Coll<ItemType>, but you can cast Coll<?> to Coll<Whatever>. Don't know if this is OK with the problem you're trying to solve Merry Christmas! On Fri, Dec 26, 2008 at 4:20 PM, Frank Staals <frankstaals@gmx.net> wrote: > Not realy a FreeBSD-specific question but I was not sure where I could find > what I was looking for elseware (Googling did not manage to dig up much > info): > > The problem: > > I want to set the type of objects some Collection object holds on runtime. > In other wors I have an object C with: C extends AbstractCollection, I have > the Class object T specifying what type of objects C should hold and I have > a method M which takes a C<T> as an argument. I made a generic version of C > (without the type) and now I have to set it so it can only carry objects of > type T. Does anyone know how to do this ? > > Information in programming style: > > C extends AbstractCollection myCollection; > Class itemType; > > > public void myMethod(C<itemType> myCollectionArgument) > > How do I convert myCollection from being a C to a C<itemType> on runtime > so I can call myMethod(myCollection) ? > > I hope the explanation of my problem makes sense and someone can help me. > > Regards, > > > -- > > - Frank > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" >
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