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

[cindy <inf...@pi...>]

In the jython doc , under Calling Methods in your Superclass", I quote
"In Pyhton, if I want to call the foo method in my superclass, I use the
following
SuperClass.foo(self)
This works with the majority of methods, but protected methods can not
be called from subclasses in this way. Instead you have to use the
"self.super_foo()" call style."  I beleave the latter syntax is telling me
I have to use inheritance. Am I wrong?
Wayne
P.S.   I have several books in which I'm using to learn java. What I thought
I do to learn jython was rewite all the examples in the book in jython. This
is how my problen came about. My the way the book is, "Beiginning Java"
by Ivor Horton

Adam Burke wrote:

> Er, no.
>
> In Java, protected methods are available to subclasses*.  Private and
> "package" (unprefixed methods, eg void myMethod()) level methods and
> attributes are not.
>
> I'd read the Java Tutorial available on the Java website if you don't want
> to buy a book.  If you do want to buy a book I'd recommend Java In A
> Nutshell.
>
> * They are also available within a package, but this is dodgy, I'd stay away
> from it.
>
> Adam Burke
>
> > -----Original Message-----
> > From: cindy [SMTP:inf...@pi...]
> > Sent: Thursday, April 05, 2001 10:11 PM
> > To:   D-Man
> > Cc:   Jyt...@li...
> > Subject:      Re: [Jython-users] A big problem for me!
> >
> > I thought I couldn't access the method enableEvents() by inheriting
> > JFrame.
> > The reason being is that this method is protected. I concluded that I have
> > to
> > inherit Component to get access to this mrthod. Therefore, the tree
> > structure
> > below and inheritance from JFrame wouldn't work for the method
> > enableEvents().
> > Is this correct?
> > Wayne
> >
> >
> > D-Man wrote:
> >
> > > On Wed, Apr 04, 2001 at 11:01:51PM -0400, cindy wrote:
> > > | > The following code worked for me :
> > > | >
> > > | > from java.awt import Component , AWTEvent
> > > | >
> > > | > class C( Component ) :
> > > | >     def __init__( self ) :
> > > | >             self.super__enableEvents( AWTEvent.WINDOW_EVENT_MASK )
> > > |
> > > | Ok. So this means that ever time I wanted to use this method,
> > "enableEvents()" I
> > > | have to
> > > | inherit Component. But lets say that I would like to extend some other
> > > | component, like
> > > | JFrame. Then if I want to use enableEvents() in the same class that I
> > want to
> > > | extend
> > > | JFrame, I would have to inherit Componet and do a composit on JFrame.
> > Is this
> > > | correct?
> > >
> > > Not quite.  If you look at the top of the documenation for JFrame you
> > > will see
> > >
> > > Class JFrame
> > >
> > > java.lang.Object
> > >   |
> > >   +--java.awt.Component
> > >         |
> > >         +--java.awt.Container
> > >               |
> > >               +--java.awt.Window
> > >                     |
> > >                     +--java.awt.Frame
> > >                           |
> > >                           +--javax.swing.JFrame
> > >
> > > JFrame already inherits from java.awt.Component.  The term "is-a" is
> > > often used with inheritance.  A JFrame object is-a Component object.
> > > If you inherit from JFrame, you are indirectly inheriting from
> > > Component.
> > >
> > > If you look farther down on the documentation page you will see a list
> > > of  "Methods inherited from Frame" and "Methods inherited from Window"
> > > and ... and "Methods inherited from Component".  Since the methods are
> > > listed there, they exist in objects of the type "JFrame".
> > >
> > > FYI, the documentation (for JDK1.2.2) is at
> > >
> > > http://java.sun.com/products/jdk/1.2/docs/api/index.html
> > >
> > > while the JFrame page is
> > >
> > > http://java.sun.com/products/jdk/1.2/docs/api/javax/swing/JFrame.html
> > >
> > > -D
> > >
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> >
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