Slides

Beginning of the Prob11Runner class

The Prob11Runner class begins in Listing 3.

Listing 3 declares several instance variables

that will be used later in the program,
initializing some of them.

Note that the class extends JFrame, so an object of the class "is a" JFrame object.

Listing 3. Beginning of the Prob11Runner class.
class Prob11Runner extends JFrame{ private Prob11Runner jFrameObj = null; private PictureExplorer explorer = null; private Picture pix; private JPanel fileNamePanel = new JPanel(); private JTextField inputFileNameField = new JTextField("Prob11a.jpg",20); private String fileName = "no file specified";

Listing 3. Beginning of the Prob11Runner class.

class Prob11Runner extends JFrame{
  private Prob11Runner jFrameObj = null;
  private PictureExplorer explorer = null;
  private Picture pix;

  private JPanel fileNamePanel = new JPanel();
  private JTextField inputFileNameField =
               new JTextField("Prob11a.jpg",20);

  private String fileName = "no file specified";

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