title: Find the most common String in ArrayList()
body: <p>Is there a way to find the most common <code>String</code> in an <code>ArrayList</code>?</p>
  
  <pre><code>ArrayList&lt;String&gt; list = new ArrayList&lt;&gt;();
  list.add("test");
  list.add("test");
  list.add("hello");
  list.add("test");
  </code></pre>
  
  <p>Should find the word "test" from this list <code>["test","test","hello","test"]</code></p>