Beginning of an anonymous listener class

This program uses an anonymous inner class

(Note however that the program could be written using a top-level class in place of the anonymous class.)

The anonymous class begins in Listing 4.

Listing 4. Beginning of the anonymous listener class. 
    button.addActionListener(new ActionListener()
      {//Begin the anonymous class definition
      
        public void actionPerformed(ActionEvent e){
          picture = world.getPicture();

          //Set picture background to green.
          picture.setAllPixelsToAColor(Color.GREEN);
          picture.setMessageColor(Color.RED);

          
          //Display the student's name on the picture.
          picture.addMessage("Dick Baldwin",10,20);
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