[jruby-user] ActionListener cannot be subclassed

Hi all,
I am trying one of the various jRuby/swing examples out there. But I allways
get a type error when I subclass ActionListener:

require ‘java‘
include_class ‘java.awt.event.ActionListener‘
include_class ‘javax.swing.JButton‘
include_class ‘javax.swing.JFrame‘
 
class ClickAction < ActionListener # exception here!!!
   def actionPerformed(event)
     puts “Button got clicked.“
   end
end
 
class MainWindow < JFrame
   def initialize
     super “JRuby/Swing Demo“
    setDefaultCloseOperation JFrame::EXIT_ON_CLOSE
 
    button = JButton.new “Click me!“
     button.addActionListener ClickAction.new
     add button
     pack
   end
end
MainWindow.new.setVisible true

Any hints?
Thx
Clemens

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