How to add components to JFrame once it's visible without having to resize it?

Question

I have a program where I have a JFrame with a JButton in it. When the user clicks the JButton, all Components of the

Answer 1

For removing (and then, for example, add new JComponents) JComponents from JPanel or from top-level containers you have to call, only once and on the end of the action:

revalidate();
repaint();

And if you only resize or change JComponents:

validate();
repaint();