protected void revalidate() {}
protected void revalidate() { GraphicsConfiguration c = GraphicsEnvironment.getLocalGraphicsEnvironment() .getDefaultScreenDevice().getDefaultConfiguration();  if (drawVBuffer.validate(c) == VolatileImage.IMAGE_INCOMPATIBLE) drawVBuffer = peer.createVolatileImage(width, height); validatedContents = true; }
    protected void revalidate() {}