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

[D-Man <ds...@ri...>]

The change you need to make is shown below.

In Java, C++ and Eiffel, member functions can be called on the current
object without specifying the object.  In Python, however, the object
(usually named 'self' but called 'this' in Java and C++, 'current' in
Eiffel) must be explicitly named.

The following 2 runme functions in java code are equivalent, and serve the
same purpose as the python function following it.

public class Foo
{
    public void func( )
    {
        System.out.println( "func was called" ) ;
    }

    public void runme( )
    {
        func() ;
    }

    public void runme2( )
    {
        this.func() ;
    }
}


class Foo :
    def func( self ) :
        print "func was called"

    def runme( self ) :
        func() # this won't work as you've seen in your code

    def runme2( self ) :
        self.func() # this will work as expected


Conclusion :
    As you read through sample Java code, prepend "this" (for java) or
    "self" (for python) to each method call on the current object.

    IMO explicit is better than implicit so I use 'this' in all my
    Java code where it won't be illegal (ie nested event handler
    classes)

HTH,
-D


On Wed, Apr 04, 2001 at 02:14:38AM -0400, cindy wrote:
| Here is the code for SketchFrame.
| 
| from javax import swing
| import java
| import java.awt.event
| 
| class SketchFrame(swing.JFrame):
|         def __init__(self, title):
|               // some code left out - it build a menu bar
|              enableEvents(java.awt.event.WindowEvent.WINDOW_EVENT_MASK)
               self.enableEvents(java.awt.event.WindowEvent.WINDOW_EVENT_MASK)
               ^^^^^
| 
|         def processWindowEvent(self, event):
|              if (event.getID() == java.awt.event.WindowEvent.WINDOW.CLOSE):
|                   java.awt.event.dispose()         # not sure if this works
| yet. I haven't gotten to this point.
|                   java.awt.System.exit(0)
|              swing.JFrame.super.processWindowEvent(event)
|