title: How to create refresh/reload in Jtree / Jtable based file listing?
body: <p>I read tutorial in <a href="https://codereview.stackexchange.com/questions/4446/file-browser-gui">File Browser Gui</a> , but if the strucutre folder changed, program cannot dynamic reload, how to create refresh/reload function in File Browser GUI ?<br>
  Here my uncomplete code<br></p>
  
  <pre><code>refreshPath = new JButton("Refresh");
  refreshPath.addActionListener(new ActionListener(){
       public void actionPerformed(ActionEvent ae) {
          ....
       }
  });
  toolBar.add(refreshPath);
  </code></pre>