title: Fading Jpanels in and out in a JFrame
body: <p>I would like to make a game with multiple JPanels in a single global JFrame. I would like to switch these JPanels but with a nice animation like fade in and fade out. How would you be able to fade a JPanel out, switch the JPanel to a new one, and fade the new in (preferably without an external library)?</p>
  
  <p>Thanks a lot</p>