title: How to initialize SortedMap?
body: <p>How do I initialize the SortedMap?  Really all I need is a series of strings that maintain the order in which they're added to the series.  I'm assuming SortedMap is even the best solution.  BUT, every time I try to set <code>cssFiles</code> to an instance of <code>Map()</code> or <code>SortedMap()</code> I get nothing.</p>
  
  <pre><code>public class Controller {
      private SortedMap&lt;Integer, String&gt; cssFiles;
      private SortedMap&lt;Integer, String&gt; jsFiles;
  
      public Controller () {
          this.addCss("global.css");
          this.addJs("global.js");
      }
  }
  </code></pre>