title: int[] and Integer[] arrays - What is the difference?
body: <p>Considering following basics:</p>
  
  <ol>
  <li>Any <code>Object</code> lives only on heap,</li>
  <li>Array IS-A <code>Object</code> and</li>
  <li><code>Integer</code> IS-A <code>Object</code></li>
  </ol>
  
  <p>I find myself difficult to answer such a simple question: Is there any difference between <code>int[]</code> and <code>Integer[]</code> <strong>inside of JVM</strong>? Or it makes sense only at "compile-time"?</p>