pedroni at inf.ethz.ch
Fri Jun 15 20:59:13 CEST 2001
I hope you know that you can do the following in jython:
self.butA = JButton("A",actionPerformed=self.butAAction);
self.butB = JButton("B",actionPerformed=self.butBAction);
or even lambdas instead of bounded methods if your code is short enough
<wink> Samuele Pedroni.
Glen Starchman wrote:
> Paul Prescod wrote:
> > In Java all of the code would have to be in a class and _onclick would
> > have to be defined in *another* class (because you can't pass references
> > to functions/methods). Thus you need inner classes.
> One of the most difficult (well, maybe not *difficult*, but
> definitely time-consuming) things in converting Java classes to
> Jython (or Python) classes is that bastard of all Java features: the
> anonymous inner class. Given code that looks like:
> class StupidExample
> JButton button = new JButton("Dumb Button");
> button.addActionListener(new ActionListener()
> actionPerformed(event e)
> What happens if you decide to add another button that has similar
> functionality? In this case, you end up writing yet another
> anonymous inner class. Icky.
> So, in Jython, what I do is either implement ActionListener in the
> parent class, and write a multi-purpose handler, or write a second
> class for the handler:
> class StupidExample(ActionListener):
> def __init__(self):
> self.button = JButton("Dumb Button")
> def actionPerformed(e):
> if e.getSource==self.button:
> Now, after typing all of that I have forgotten my point... oh,
> yeah... Inner Classes (and *especially* Anonymous Inner Classes)
> > In some languages without first-class classes, you hack classes through
> > function "closures". In languages without first-class functions, you
> > hack functions through "one-method classes". Python has both and you
> > don't have to hack!
> Hurray for Python!
> > --
> > Take a recipe. Leave a recipe.
> > Python Cookbook! http://www.ActiveState.com/pythoncookbook
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