Is chain of StringBuilder.append more efficient than string concatenation?
<p>According to Netbeans hint named <strong>Use chain of .append methods instead of string concatenation</strong></p>

<blockquote>
  <p>Looks for string concatenation in the parameter of an invocation of the append method of StringBuilder or StringBuffer.</p>
</blockquote>

<p>Is StringBuilder.append() really more efficient than strings concatenation?</p>

<p>Code sample</p>

<pre><code>StringBuilder sb = new StringBuilder();
sb.append(filename + "/");
</code></pre>

<p>vs.</p>

<pre><code>StringBuilder sb = new StringBuilder();
sb.append(filename).append("/");
</code></pre>
