title: java nested JSONArray
body: <p>I want to know if it is possible to check if some key exists in some jsonArray using java. For example: lets say that I have this json string:</p>
  
  <pre><code>{'abc':'hello','xyz':[{'name':'Moses'}]}
  </code></pre>
  
  <p>let's assume that this array is stored in jsnArray from Type <code>JSONArray</code>.
  I want to check if 'abc' key exists in the jsnArray, if it exists I should get <code>true</code> else I should get <code>false</code> (in the case of 'abc' I should get true). 
  Thnkas</p>