title: Singleton vs Static Preference and Defect
body: <p>When we want deploy Web Application should we use singleton Object or use Static instead of?
  what is the bottleneck for use each of them?
  I should know about Memory Problem , Concurrency problem and ... .</p>
  
  <p>P.S: what happen for the class that was just readable (should use static or  Singleton)</p>
  
  <p>P.S 2: what happen for the class that was readable and writable </p>