title: Why super keyword in generics is not allowed at class level
body: <p>In Generics </p>
  
  <p><code>class A&lt;T extends Number&gt;</code> is allowed</p>
  
  <p>But </p>
  
  <p><code>class A&lt;T super Integer&gt;</code> is not allowed</p>
  
  <p>I'm not getting this point. This may sound like novice question but I'm stuck in it</p>