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

[Adam B. <ada...@gb...>]

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
> >
> > _______________________________________________
> > Jython-users mailing list
> > Jyt...@li...
> > http://lists.sourceforge.net/lists/listinfo/jython-users
> 
> 
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