Constructor for GUI class

Listing 12 instantiates an object of type MyFrame (not Frame),

Otherwise, this is pretty standard stuff.

Listing 12. Constructor for GUI class.
 
class GUI {
  public GUI(){//constructor
    MyFrame displayWindow = new MyFrame();
    displayWindow.setSize(300,300);
    displayWindow.setTitle(
      "Copyright 1997, R.G.Baldwin");
    displayWindow.setVisible(true);
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