title: static final vs an instance final when and why? Java interview question
body: <p>Suppose we have</p>
  
  <pre><code>final double pi = 3.14159
  </code></pre>
  
  <ul>
  <li><p>Should we make above statement static or not?</p></li>
  <li><p>When we'd want static final vs an instance final?</p></li>
  </ul>