title: How can I return the difference between two lists?
body: <p>I have two array lists e.g. </p>
  
  <pre><code>List&lt;Date&gt; a;
  contains : 10/10/2014, 10/11/2016
  
  List&lt;Date&gt; b;
  contains : 10/10/2016
  </code></pre>
  
  <p>How can i do a check between list <code>a</code> and <code>b</code> so the value that is missing in <code>b</code> is returned?e.g. <code>10/10/2014</code></p>