Register a ChangeEvent listener on the slider

Listing 5 registers an anonymous listener object on the slider.

Each time the slider fires a ChangeEvent,

Listing 5. Register a ChangeEvent listener on the slider. 
    slider.addChangeListener(
      new ChangeListener(){
        public void stateChanged(ChangeEvent e){

          display = edgeDetector(
                      butterfly,slider.getValue());
          display.repaint();

        }//end stateChanged
      }//end new ChangeListener
    );//end addChangeListener
    //----------------------------------------------//
  }//end constructor
  //------------------------------------------------//
}//end class Prob08Runner
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