prev = node.getPreviousNode();
prev = getPreviousNode(node);
   DefaultMutableTreeNode getPreviousVisibleNode                                             (DefaultMutableTreeNode node)   {      DefaultMutableTreeNode prev = null;      TreePath current = null;      if (node != null)         prev = node.getPreviousNode();      if (prev != null)      {         current = new TreePath(prev.getPath());         if (tree.isVisible(current))            return prev;         while (prev != null && !tree.isVisible(current))         {            prev = prev.getPreviousNode();            if (prev != null)               current = new TreePath(prev.getPath());         }      }      return prev;   }