title: How to access list of ArrayList elements
body: <p>I have List of ArrayList Elements, see below.</p>
  
  <pre><code>List&lt;List&lt;String&gt;&gt; x = new ArrayList&lt;List&lt;String&gt;&gt;();
  </code></pre>
  
  <p>it contains some array list elements.</p>
  
  <p>eg.</p>
  
  <pre><code>x.get(0)-&gt;[1,2,3,4],
  x.get(1)-&gt;([5,6,7,8],
  x.get(2)-&gt;[9,10,11,12],
  x.get(3)-&gt;[13,14,15,16]
  </code></pre>
  
  <p>i want to access element 3 from x.get(0) or element 7 from x.get(1) how to call that??</p>