title: How to create nested list in list
body: <p>why this declaration </p>
  
  <pre><code>List&lt;String&gt; ls = new ArrayList&lt;&gt;(new ArrayList&lt;&gt;(new ArrayList&lt;&gt;(Arrays.asList("A"))));
  </code></pre>
  
  <p>does not give me a nested ArrayList back? What i get is a list with one element ("A") inside.</p>