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Reports code that uses of <b>==</b> or <b>!=</b> to compare strings.
<p>
  These operators determine referential equality instead of comparing content.
  In most cases, strings should be compared using <code>equals()</code>,
  which does a character-by-character comparison when the strings are different objects.</p>
<p><b>Example:</b></p>
<pre><code>
  void foo(String s, String t) {
    final boolean b = t == s;
  }
</code></pre>
<p>If <code>t</code> is known to be non-null, then it's safe to 