if (a != null && a instanceof A) ... or if (a instanceof A)
<p>For the following conditionals:</p>

<pre><code>if (a != null &amp;&amp; a instanceof A)
</code></pre>

<p>or</p>

<pre><code>if (a instanceof A)
</code></pre>

<p>Is there any advantage (for example, performance-wise) to check for <code>null</code> first? Both conditionals should be equal in result.</p>
