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public class SwingUtil {    public static void expandTree(JTree tree) {        TreeNode root = (TreeNode) tree.getModel().getRoot();        expandTree(tree, new TreePath(root));    }    public static void expandTree(JTree tree, TreePath path) {        TreeNode node = (TreeNode) path.getLastPathComponent();        // Go to leaf        if (node.getChildCount() > 0) {            Enumeration
   
     children = node.children();            while (children.hasMoreElements()) {                TreeNode n = children.nextElement();                TreePath newPath = path.pathByAddingChild(n);                expandTree(tree, newPath);            }        }        tree.expandPath(path);    }}
   

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