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

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

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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