Re: accessing subclasse methods and fields with introspection / reflection

From:
"Samy" <samy@samy.com>
Newsgroups:
comp.lang.java.help
Date:
Thu, 3 Aug 2006 10:22:36 +0200
Message-ID:
<easa53$rdm$1@reader1.imaginet.fr>
I didn't know of that proxy class. I will check in that area. Thank you

"Remi Arntzen" <Remi.Arntzen@gmail.com> wrote in message
news:1154543577.335649.21480@i42g2000cwa.googlegroups.com...

Samy wrote:

Hi everyone,

Now I would like to have a A.listMyMethods() which would return all the
processA, processB, processC and processD (since they are all abstract
except D meaning that an instance of my classes would could not be
something
else than D)


I took a quick look at the java.lang.Class documentation and couldn't
find a way to find a way to determin it's subclasses.

From my tests, when I instanciate a D object and invoke a
myDObject.getClass().getMethods() I have what I want. But what I really
would want is to call myDObject.listMyMethods(). So that the object
itself
would tell me it's methods.


java.lang.reflect.Proxy.newProxyInstance(D.getClass().getClassLoader(),
blah, k);

where k = new InvocationHandler() {
       Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
           if (method.getName() == "listMyMethods") {
               return proxy.getClass().getMethods();
           } else {
               return method.invoke(proxy, args);
           }
       }
}

pragmatically override any method. muhahahaaaa!
also note that I haven't actually used this method in a while, so my
understanding of it might not be completely accurate/(work at all).

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