Help with JTree

Question

I wrote a cls that extends JTree....I have defined the root node in this class.
Public class a extends JTree{
/// global variable nd constructor
public void JTReader()
DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
           m_model = new DefaultTreeModel(root);
            //program logic to get the parent and child nodes
       //method defined for adding child to parent
       addNode (child,parent);
      //rest of the code
     expandRoot();
     setBounds(0,0,500,500);
public void addNodeTo(String childNodeName, String parentNodeName)
          //code for chking if the node is already present
          //add child to parent at the end of child list
          ((DefaultTreeModel)getModel()).insertNodeInto(childNode, parentNode, parentNode.getChildCount());     
     }     I want to call this class in my main program which extends Jpanel�.
I have written this
public class LibGui extends JDialog{
private JTreeReader tree;
  JTree newtree;
Constructor{
    libInit();
void libInit() throws Exception {
initializing the panel�
         updateclslist(projectName);
        libScrollPane = new JScrollPane(tree);
        libScrollPane.add(tree);
       clslistHolder.add(libScrollPane, BorderLayout.CENTER);
      cbPanel.add(clslistHolder, BorderLayout.CENTER);
//rest of code
protected void updateclslist(String projectName){
    JTreeReader tr = new JTreeReader(projectName);
    tree.JTReader();
     }       

Answer 1

Swing related questions should be posted in the Swing forum.
The Swing tutorial on [url http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html]How to Use Trees has working examples.