protected void revalidate() {}
protected void revalidate() { GraphicsConfiguration c = GraphicsEnvironment.getLocalGraphicsEnvironment() .getDefaultScreenDevice().getDefaultConfiguration();  for (int i = 0; i < backBuffers.length; i++) { int result = backBuffers[i].validate(c); if (result == VolatileImage.IMAGE_INCOMPATIBLE) backBuffers[i] = c.createCompatibleVolatileImage(width, height); } validatedContents = true; }
    protected void revalidate() {}