Saving and retreiving JTree structure

Question

Hi everybody
In the following code I had intended to save the path of expanded nodes of a tree just before collapsing and retreiving the same structure of the tree again , but the path is not expanding at all .
Can any body help me to solve the problem
Vector paths
public void saveTreePaths() {
          Object path = selectionTree.getModel().getRoot();
                           paths = new Vector();
          TreePath tp = new TreePath(path);
          nodes = selectionTree.getExpandedDescendants(tp);
          while(nodes.hasMoreElements()) {
               paths.add(nodes.nextElement());
     public void reloadTreePath() {
             for(int j = 0; j < paths.size(); j++) {
                 TreePath  Path = (TreePath) paths.get(j);
                  selectionTree.expandPath(Path);      
                                    }

Answer 1

Hi Deepak!
The problem is to expand a certain node on a certain path all parent nodes should be expanded for the node(lastPathComponent). If you had looked at the enumeration(Saved paths) it is not in tree order. So you have to order them. Here is the code which as I think (I've checked it and it worked) will help you.
  private void expandSavedPaths(List listOfSavedPathes)
    Comparator c = new Comparator()
      public int compare(Object tp1, Object tp2)
        return ((TreePath) tp2).getPathCount() - ((TreePath) tp1).getPathCount();
    };//comparator which compares only by tree path length i.e. level
    //enshure that the tree pathes are sordted by node level,
    //which enables to expand tree nodes which parents are already expanded
    java.util.Collections.sort(listOfSavedPathes, c);
    for (int i = 0; i < listOfSavedPathes.size(); i++)
      opTree.expandPath((TreePath) listOfSavedPathes.get(i));
  }