Re: abstract classes and generic types

From:

Lew <noone@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 17 May 2009 15:58:02 -0400

Message-ID:

<gupq8b$kl1$1@news.albasani.net>

Giovanni Azua wrote:

AFAIK you can't do A generic without ressorting to reflection to get hold
of the right constructor for the Number subclass.

Lew wrote

I don't understand what you mean exactly. 'A' is generic as you show it
here.

Giovanni Azua wrote:

Indeed you are right, I meant the generic not in the proper sense of
genericity but generic in the sense of A being concrete and reusable for all
cases without need to implement concrete subclasses "a generic solution" I
can't recall where I learned this second definition from ... :)

Lew wrote

'my_func()' should be named in accordance with the naming conventions, and
meaningfully, say 'getValue()'. The methods should probably be 'public'.
(And, of course, the classes should belong to packages.)

Giovanni Azua wrote:

I agree but you won't help and address the OP by completely changing her
example, I guess you will confuse her.

I hope not. horos11, if you are confused please feel free to ask more
questions and we'll work to clear it up.

Bad habits not caught early and corrected early are all the harder to correct.
Begin by doing things correctly. It's less to unlearn later.

The coding conventions are documented in
<http://java.sun.com/docs/codeconv/index.html>
(I admit, proudly, that I use the other convention for opening brace "{"
placement.)

More of your questions can be answered starting at the Java tutorials:
<http://java.sun.com/docs/books/tutorial/index.html>
and the links from there.

--
Lew