title: How to add element to existing JList
body: <p>Part of my code</p>
  
  <pre><code> ArrayList&lt;Item&gt; i = g.getItems(); 
   Vector itemsVector = new Vector(i); 
   JList items = new JList(iemsVector); 
  </code></pre>
  
  <p>Later in the code I create new object which I want to add to JList. How can I do that?</p>