Yes, this is quite unfortunate, and I can tell you that this is one
of the issues where there was much discussion in the EG and in the
groups of people trying to influence JSR 14. The bottom line is that
the chosen implementation of generics works without any changes to
the JVM, and that code compiled with generics could theoretically be
run with and older JVM. In practice this kind of backwards
compatibility doesn't work anyway because of the bytecode version
burned into class files by a JDK 1.5 compiler. But as allways these
decisions are piled up agains a lot of different technical as well as
political issues...
Kresten
On Oct 1, 2007, at 8:11 AM, Jason Dillon wrote:
Alright... thanks, that is what I figured :-( So lame... I can
figure out that a class as T and E bound, but I can't figure out
the type of those buggers... so stupid :-(
--jason
On Sep 30, 2007, at 11:08 PM, David Jencks wrote:
On Sep 30, 2007, at 10:48 PM, Jason Dillon wrote:
Any of you generics experts out there know if there is any way to
get the generic type from a generic class... like, say you have:
Class type = new ArrayList<String>().getClass();
Is there any way to determine that this is an ArrayList
containing String objects? I can't seem to figure out how to get
this information out of the Class instance. I can figure out
what the type variable name was, er like T, but that is well,
completely useless IMO.
Does anyone know if its possible and how to do it?
I spent a couple days reading up on generics and trying stuff and
concluded it was not possible. There are some statements in the
book on generics that confirm this. Hopefully you will find a way
to prove I'm wrong 'cause it sure would be handy :-)
sorry
david jencks
--jason
Kresten Krab Thorup, Ph.D.
CTO, Trifork
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