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Reports String concatenation in loops.
<p>
  As every String concatenation copies the whole
  string, usually it is preferable to replace it with explicit calls to <code>StringBuilder.append()</code> or
  <code>StringBuffer.append()</code>.
</p>
<p><b>Example:</b></p>
<pre><code>
  String str = "";
  for(int i=0; i&lt;10; i++) {
    str += i;
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  String str = "";
  StringBuilder strBuilder = new StringBuilder(str);
  for(int i 