title: Getting info about a Class in IntelliJ IDE by hovering over it
body: <p>In EClipse if I hold the mouse over a class name I get some hint like the picture below about it:</p>
  
  <p><img src="https://i.stack.imgur.com/lIuKs.png" alt="enter image description here"></p>
  
  <p>But with doing the same I don't get that hint box in IntellijIDEA.(Mac edition)
  Is there a setting somewhere to set this? It is really helpful.</p>