TreeNode rootNode = createNodes();
tree = new JTree(rootNode);
tree.addTreeExpansionListener(this);
tree.addTreeWillExpandListener(this);
.......
.......
setViewportView(tree);

private TreeNode createNodes() {
            DefaultMutableTreeNode root;
            DefaultMutableTreeNode grandparent;
            DefaultMutableTreeNode parent;

            root = new DefaultMutableTreeNode("San Francisco");

            grandparent = new DefaultMutableTreeNode("Potrero Hill");
            root.add(grandparent);

            parent = new DefaultMutableTreeNode("Restaurants");
            grandparent.add(parent);
           
            dummyParent = parent;
            return root;
        }

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