title: JSONObject keySet() function not there?
body: <p>Very confused.
  New project, add this code:</p>
  
  <pre><code>import org.json.JSONObject;
  
  JSONObject jsonObject = new JSONObject();
  jsonObject.keys();
  jsonObject.keySet();
  </code></pre>
  
  <p><code>.keys()</code> method resolves as it should.</p>
  
  <p><code>.keySet()</code> method highlights red with AndroidStudio giving "Cannot resolve method keyset()" error.</p>
  
  <p>If i go to keys() definition, here they both are public and all: <a href="http://goloskok.com/u/2015-07-01_16-41-08.jpg" rel="nofollow">http://goloskok.com/u/2015-07-01_16-41-08.jpg</a></p>
  
  <p>What am I doing wrong?</p>