The behavior from a big-picture viewpoint

Listing 8 begins the registration

Listing 8. Begin the registration of an event handler on the slider. 
    slider.addChangeListener(
      new ChangeListener(){
        public void stateChanged(ChangeEvent e){
          //Draw a new copy of the background on the
          // display.
          graphics = display.getGraphics();
          graphics.drawImage(
                          background.getImage(),0,0,null);
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