title: Use of static private attributes
body: <p>I'm having trouble understanding the use of private static attributes in a class :</p>
  
  <p>-> private means the attributes will only be accessible from the class itself if I'm correct</p>
  
  <p>-> static indicates the attributes belong to the class itself and not the object and, if I'm still correct, which permit to access it without creating an object</p>
  
  <p>So, I can't imagine any use of a private static attribute.</p>
  
  <p>Thanks in advance for any help :)</p>
  
  <p>Kenshin</p>