Frame vs. Applet - Java-Gaming.org

These are the methods I use, it will run either as an applet or a standalone application.
If this isn't a good way to do it, hopefully, someone else will offer improvements.

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public class GameApplet extends Applet {

   private static JFrame parentFrame=null;
   private static boolean blnApplet = false;
   private static int frameWidth;
   private static int frameHeight;

   public GameApplet() {
      super();
      enableEvents(AWTEvent.MOUSE_EVENT_MASK);
      enableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
      enableEvents(AWTEvent.KEY_EVENT_MASK);
      blnApplet = true;
   }

   public GameApplet(JFrame f) {
      this();
      parentFrame = f;
      initialized = false;
      blnApplet = false;
   }

   public void init() {
      blnApplet = true;
   }

   public void destroy() {
   }

   public void reset() {
      ...
      Initialize game objects here, load images, etc.
      ...
      initialized = true;
   }

   public void start() {
      new Thread() {
         public void run() {
            render();
            ...
            game loop goes here
            ...
            if (!blnApplet) {
               System.exit(0);
            }
         }
      }.start();
   }

   public void stop() {
   }

   public void render() {
      if (initialized) {
         ...
         draw on gDisplay here
         ...
         Graphics g;
         try {
            g = this.getGraphics();
            if (g != null) {
               g.drawImage(imgDisplay, 0, 0, null);
               g.dispose();
            }
         } catch (Exception e) {
         }
      }
   }

   public void update(Graphics g) {
      paint(g);
   }

   public void addNotify() {
      super.addNotify();
      GraphicsDevice device = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
      DisplayMode displayMode = device.getDisplayMode();
      frameWidth = displayMode.getWidth();
      frameHeight = displayMode.getHeight();
      frameWidth = 800;
      frameHeight = 600;
      if (!blnApplet && parentFrame != null) {
         parentFrame.setSize(parentFrame.getInsets().left + parentFrame.getInsets().right + frameWidth, parentFrame.getInsets().top + parentFrame.getInsets().bottom + frameHeight);
      }
      imgDisplay = createImage(frameWidth, frameHeight);
      gDisplay = imgDisplay.getGraphics();
      reset();
   }

   public static void main(String[] args) {
      GameFrame frame = new GameFrame(gameName);
      GameApplet game = new GameApplet(frame);
      frame.add("Center", game);
      frame.setUndecorated(true);
      frame.setIgnoreRepaint(true);
      frame.setVisible(true);
      game.start();
   }
}

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public class GameFrame extends JFrame {
   public GameFrame(String str) {
      super (str);
      enableEvents(AWTEvent.WINDOW_EVENT_MASK);
   }

   protected void processEvent(AWTEvent evt) {
      switch (evt.getID()) {
         case WindowEvent.WINDOW_CLOSING:
            dispose();
            System.exit(0);
         default:
            super.processEvent(evt);
      }
   }
}