How to dynamically add Nodes to JTree?

How to add nodes to a Jtree by getting the information into a specific file
For example, in JList:
DefaultListModel workgroups;
workgroups = new DefaultListModel();
List<String> workgroupsList = new ArrayList<String>();
workgroupsList = ParserUtils.getWorkgroupList(ParserUtils.getConfigPath() + "\\.workgroup.properties");
if (!workgroupsList.isEmpty()){
     for (String workgroup : workgroupsList){
          workgroups.addElement(workgroup.toString().trim());
workgroupList = new JList(workgroups); //adds the list workgroupsThe output of this will be a JList displaying the list of workgroups per line. The list could be found in a file name "workgroup.properties"
Question is, is it possible to adapt this same method in JTree. The information per line will serve as one node in the tree. For example, I have 3 workgroups in the list, there will also be 3 nodes to be found in the tree.
Any suggestions?
THanks.

There's a huge JTree example in the Swing tutorial. It's a bit of a beast to use.

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