RE: [Jython-users] A big problem for me!

[Brian Z. <bz...@ig...>]

( I'm perfectly comfortable being corrected when I'm wrong. )

Point well made, I'll be more careful next time ;)

D-Man is indeed correct and offered a better explanation of object vs.
class than I did.

Sorry for any confusion and thanks for the clarification.

brian


-----Original Message-----
From: jyt...@li...
[mailto:jyt...@li...]On Behalf Of D-Man
Sent: Wednesday, April 04, 2001 9:30 AM
To: Jyt...@li...
Subject: Re: [Jython-users] A big problem for me!



( I don't mean to be condescending at all, but I want to make sure this
  doesn't cause some confusion.  )

An object can't be abstract, only classes can.  Objects also can't be
subclassed, only classes can be subclassed.  Also, 'self' hasn't been
"called", it was only used to access an attribute. =20

(calling it would look like

self() or self( <some arguments here> ) and would require defining the
function  __call_

)



I think Brian knows this, but mixed a couple of terms around in
writing this.  Other than the wording issues, everything Brian said is
accurate and (hopefully) helpful to you.

-D


On Tue, Apr 03, 2001 at 03:05:05PM -0500, Brian Zimmer wrote:
|=20
|    Wayne,
|   =20
|    You can call "self" on an abstract object, you just can't
instantiate
|    an abstract object.  An abstract object has all the state and
|    behaviour of a normal, concrete object it just can't live on it's
|    own.  It needs to be subclassed and made abstract.  For a good
example
|    of this, check out the java.io.* packages, in particular, either
the
|    Reader/Writer or InputStream/OutputStream classes and their
|    subclasses.  Look at FileReader and you'll notice it is an
|    implementation of the abstract Reader class, all FileReader
provides
|    to Reader is how to get the initial data, in this case a File.
|   =20
|    Python really doesn't have the notion of an abstract class, in
general
|    an abstract class or interface is implemented by defining a bunch
of
|    methods which raise Exceptions.
|   =20
|    So in your case, you can't instantiate a Component, but you can get
|    subclasses of Component and then call methods on them.
|   =20
|    hope this helps,
|   =20
|    brian

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