title: Java 2D Graphics
body: <p>I want to develop a java graphic application. The concept is that there will be a circle in the middle and several balls will rotate around the circle. Is it possible to make the circle stable forever and only change the position of balls? If it is, how? Also, Is it possible to get a circle or ball like a normal java object? </p>
  
  <p>When I use repaint() method, all of the drawings are repeated. But I do not want to change the location of circle, I only want to change the position of ball that I need.</p>
  
  <p>Thanks.</p>