title: Word frequency count Java 8
body: <p>How to count the frequency of words of List in Java 8?</p>
  
  <pre><code>List &lt;String&gt; wordsList = Lists.newArrayList("hello", "bye", "ciao", "bye", "ciao");
  </code></pre>
  
  <p>The result must be: </p>
  
  <pre><code>{ciao=2, hello=1, bye=2}
  </code></pre>