RE: switch on String?

It's no problem, Brad. I'll try to do a little explaining as I go, but these
very fundamental concepts are a little more difficult to explain on a forum.
I usually need a projector and a whiteboard <smile>.

I also suggest that you read the Design Patterns book and perhaps pick up
the free electronic book Thinking in Java.  If you're serious about learning
the OO subjects, you're going to need to do lots of reading and playing.

For example, to put together a snippet of code that simply explains the
concept of polymorphism is pretty much impossible.  I have some stuff on the
web.  If you haven't done so, read my example of the Light on my webpage:

http://www.java400.net/examples/Light/light.htm

If you have, and you still don't understand interface, class and object,
then reread it and ask some questions.  That example is the one I use when I
teach RPG programmers, and it usually makes the light go on (pardon the pun
<grin>).  Then go on  to the Shapes example, which does a good job of
explaining inheritance and polymorphism.  And then finally, the Yard example
attempts to use the various concepts in a trivial but working program.

Having finished that and having read the Design Patterns book, the
AbstractWidget and its descendants should begin to make sense to you.

Joe



> -----Original Message-----
> From: owner-java400-l@midrange.com
> [mailto:owner-java400-l@midrange.com]On Behalf Of Stone, Brad V (TC)
> Sent: Tuesday, March 06, 2001 4:19 PM
> To: 'JAVA400-L@midrange.com'
> Subject: RE: switch on String?
>
>
> Joe,
>
> Just so you know, you're going way over my head with your
> statements.  This
> isn't bad, I know I do it too on other subjects.  I also realize
> this isn't
> a "newbie Java list".  So, if I'm getting annoying with my
> questions, let me
> know.  Also, if there are others that wouldn't mind a lower level
> explanation to these things, speak up.  I know you're out there.  ;)
>
> What really helps me in this case is your explanation followed by a small
> snippet of code showing how something is done.   I realize that may not be
> so easy with OO, but it helps just the same.  Thanks!
>
> Brad
>
> > -----Original Message-----
> > From: Joe Pluta [mailto:joepluta@plutabrothers.com]
> > Sent: Tuesday, March 06, 2001 2:23 PM
> > To: JAVA400-L@midrange.com
> > Subject: Re: switch on String?
> >
> >
> > Nope.  Use:
> >
> >   if (string.equals(case1) doCase1();
> >   else if (string.equals(case2)) doCase2();
> >   else doOtherCase();
> >
> > Be careful, though.  This is one of those situations where
> > you should begin to think about your object model.  Methods
> > with case statements should immediately suggest subclassing
> > and overriding.  That way, you can expand your case list
> > without changing lines of code and potentially missing a case
> > statement in one of your methods.
> >
> > Joe
> >
> >
> > ---------- Original Message ----------------------------------
> > From: "Stone, Brad V (TC)" <bvstone@taylorcorp.com>
> > Reply-To: JAVA400-L@midrange.com
> > Date: Tue, 6 Mar 2001 13:36:16 -0600
> >
> > >Is there an equivalent switch statment that can be used on a string?
> >
> > Something like:
> >
> > switch(string)
> > {
> >   case "X": blah; break;
> >   case "Z": blahblah; break;
> > }
> >
> > Seems it requires int.  Javascript doesn't.  ;)
> >
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