You must call private JFrame frame = new JFrame(); … … frame.getContentPane().removeAll(); frame.repaint(); removeAll() has not been overridden as add() or remove() to forward to the contentPane as necessary.
How does the browser take the rules in this stylesheet and apply it to the HTML? Typically this is done in a streaming fashion. The browser reads the HTML tags as a stream, and applies what rules it can to the elements it has seen so far. (Obviously this is a simplification.) An interesting related … Read more
Personally I would forget about performance in this instance and focus on what the image is: 1) Image = content 2) Background Image = design The way I tend to think about this is, do I want the image to appear on all screen sizes, on all devices, with CSS turned either on or off? … Read more
This posting seems to cover the reflow vs repaint performance issues Reflows & Repaints: CSS Performance making your JavaScript slow? As for definitions, from that post: A repaint occurs when changes are made to an elements skin that changes visibly, but do not affect its layout. Examples of this include outline, visibility, background, or color. … Read more