RE: Declaring Java classes and methods

Hi Colin,
I usually write a clle that sets up the class path env variable with the
desired paths passed in from command.  But am curious about the custom
classloader. Where can I find info on this?
Thanks,
Sudha

Sudha Ramanujan
SunGard Futures Systems
sramanujan@xxxxxxxxxxxxxxxxxx
(312) 577 6179
(312) 577 6101 - Fax

-----Original Message-----
From: colin williams [mailto:colin.williams@xxxxxxxxxxxx] 
Sent: Monday, August 30, 2004 2:26 PM
To: Java Programming on and around the iSeries / AS400
Subject: Re: Declaring Java classes and methods

Joe,

if you need to write a custom classloader, there are some articles on
the
IBM developerworks site that discuss this(assuming you havent done this
before!).

I recently knocked up a custom classloader so that i could setup my
classpath dynamically, rather than setting using the RUNJVA command.

I had an application that used a component dependent on a lot of open
source
JARS, and I didnt want to type them all in to the classpath one by one.
So I created custom classloader that I could point at a directory, and
it
would add all the jars to the classpath.

cheers
Colin.W

----- Original Message ----- 
From: <furgalj@xxxxxxxxxxxxxxxx>
To: <java400-l@xxxxxxxxxxxx>
Cc: <java400-l@xxxxxxxxxxxx>; <java400-l-bounces@xxxxxxxxxxxx>
Sent: Monday, August 30, 2004 3:36 PM
Subject: Re: Declaring Java classes and methods


> Joe Pluta wrote:
>
> >I'm a little unclear as to how tightly typed the type O variables
are.
> >If I declare a type O variable as class Widget, must I instatiate an
> >object of type Widget to stick in there?  Can I use a subclass of
> >Widget?  Can I use a class that's NOT a subclass, provided the method
I
> >later invoke has the same signature?
> >
> >I can do this with a factory method.  I'd have to instatiate the
> >factory, and then pass the class name into the factory as a parameter
to
> >instantiate the actual object (or have a delegate method in the
factory
> >that emulates the desired method, only taking a class name as well).
It
> >would be a little easier if I could do it in the RPG, is all.
>
> Joe, maybe I'm stating the obvious here, and you've already looked
into
> this, but if not, it might be worth a try. I believe what you need is
a
> custom class loader. You can write them yourself if you study how Java
> does it. This could be a static class and loader method, so that when
you
> called it with the class.method variable name it would not have to be
> instantiated each time. You might even be able to do some of this in
RPG,
> but I'm not at all sure about that. But I have seen and heard of
people
> writing stranger class loaders than that -)! Also, as to your last
point,
> can't you define interfaces for the classes and methods you're
interested
> in ant invoke them via the interface method? By doing this you should
be
> able to slip in almost anything as long as the signature matches.
>
>
> _________________________________________________________________
> Jeff Furgal / MIMIX User Interface Product Architect / Lakeview
Technology
>
> furgalj@xxxxxxxxxxxxxxxx / 630-282-8360
>
> LAKEVIEW TECHNOLOGY CONFIDENTIAL
>
> This e-mail may contain SECRET, PRIVILEGED AND/OR CONFIDENTIAL
INFORMATION
> intended only for the use of the addressee.  If you are not the
addressee,
> or the person responsible for delivering it to the person addressed,
you
> may not copy or deliver this to anyone else.  If you received this
e-mail
> in error, please immediately notify Lakeview by returning the original
> message to the sender via e-mail.
> --
> This is the Java Programming on and around the iSeries / AS400
(JAVA400-L)
mailing list
> To post a message email: JAVA400-L@xxxxxxxxxxxx
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/java400-l
> or email: JAVA400-L-request@xxxxxxxxxxxx
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/java400-l.
>
>


This e-mail has been sent by a company of Bertram Group Ltd, whose
registered office is 1 Broadland Business Park, Norwich, NR7 0WF. 
This message, and any attachments, are intended solely for the addressee
and may contain privileged or confidential information.  If you are not
the intended recipient, any disclosure, copying, distribution or any
action taken or omitted to be taken in reliance on it, is prohibited and
may be unlawful.  If you believe that you have received this email in
error, please contact the sender immediately. Opinions, conclusions and
statements of intent in this e-mail are those of the sender and will not
bind a Bertram Group Ltd company unless confirmed in writing by a
director independently of this message. 
Although we have taken steps to ensure that this email and any
attachments are free from any virus, we advise that in keeping with good
computing practice the recipient should ensure they are actually virus
free.

--
This is the Java Programming on and around the iSeries / AS400
(JAVA400-L) mailing list
To post a message email: JAVA400-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/java400-l
or email: JAVA400-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/java400-l.