o2 == o3</code> are true, then <code>o1 == o3</code> must be true.</p>
</li>
</ul>
<p>The method should also be consistent over time,
so whether two objects are equal should only change
if at least one of the objects was modified.</p>
<p>If a subclass overrides the equality operator, it should override
the <a href="../../properties_note/Note/hashCode.html">hashCode</a> method as well to maintain consistency.</p>
</section>


    
<section class="summary source-code" id="source">
  <h2><span>Implementation</