title: Drawing a bounding rectangle to select what area to record
body: <p><img src="https://i.stack.imgur.com/QFNpx.png" alt="bound"></p>
  
  <p>How do I draw that semi-transparent rectangle on the screen? 
  That cannot be a <code>JFrame</code> because JFrames have the usual close, minimize, maximize options in top right.<br>
  if it is indeed a swing competent, How is it drawn in thin air? Without inserting it in a <code>JFrame</code> whatsoever?
  Please tell me what it is and how I can implement it...</p>