how to fill the jtree with the last modified value ?

[naved momin]

i need your help guyz i have coded a program with Jtree which is just displaying two nodes and 2 leaf nodes in one node and one is root
and also i have implemented a code within that to change the name of any leaf node dynamically means user can change the name as per his needs
till now it works fine , i mean the code does his job well by allowing to edit the nodes and rename them , but problem occurs when i restart that application the earlier modifications are just lost
and that was very easy to catch it was happening because i was filling the tree with the hard coded values from the constructor ...but i need to know how to replace my modified value with the hard coded ones because at any cost i need to fill the tree at start up so that user can see all its files
but how is this possible to retrieve the last change and replace it when we are filling the tree at start up so that our users can see the modified name of any file ?

code is

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package jtreedemo;


public class EditableTreeDemo implements  TreeModelListener{

 
    
    JFrame frm;
    JPanel panel;
    JTree tree;
     JLabel label;
     
  
     DefaultTreeModel treemodel;
     DefaultMutableTreeNode catogary ;
        DefaultMutableTreeNode book ;
        DefaultMutableTreeNode rootNode;
    public void  JTreeDemo() {
        frm = new JFrame("Tree");
        panel = new JPanel();
         rootNode = new DefaultMutableTreeNode("Root");
        treemodel = new DefaultTreeModel(rootNode);
        
        treemodel.addTreeModelListener(this);
        
        createNodes(rootNode , null);
        
        tree = new JTree(treemodel);

        tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
        
        
        JScrollPane treescroll = new JScrollPane(tree);
        
        Dimension size = new Dimension(900,800);
        
        tree.setMinimumSize(size);
        panel.setMinimumSize(size);
       
        
        
        
        
        tree.setEditable(true);
        
        tree.setShowsRootHandles(true);
        
        tree.setRootVisible(true);
        panel.add(treescroll);
        frm.add(panel , BorderLayout.CENTER);
        frm.pack();
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frm.setVisible(true);
        
        
        
    }
    
    
    public static void main(String[] args) {
        // TODO code application logic here
        new EditableTreeDemo().JTreeDemo();
    }

    private void createNodes(DefaultMutableTreeNode top , String update) {
        

        
        
            catogary = new DefaultMutableTreeNode("java string");
            top.add(catogary);
        
        
        
        
        
        book = new DefaultMutableTreeNode("ho");
        catogary.add(book);
        
        book = new DefaultMutableTreeNode("JFS.pdf");
        catogary.add(book);
        
        
        
        
        
    }

   

    @Override
    public void treeNodesChanged(TreeModelEvent e) {
        
        
        
        DefaultMutableTreeNode node ;
        node = (DefaultMutableTreeNode)(e.getTreePath().getLastPathComponent());
        
        
        
        int index = e.getChildIndices()[0];
        
        node = (DefaultMutableTreeNode) node.getChildAt(index);
        
        TreePath parentpath = tree.getSelectionPath();
        System.out.println(parentpath);
        DefaultMutableTreeNode parentNode  = null;
        
        
        
        
          DefaultMutableTreeNode parent = null;
        if(parentpath == null)
        {
            
        }
        else
        {
            parentNode = (DefaultMutableTreeNode) parentpath.getLastPathComponent();
            parent = (DefaultMutableTreeNode) parentNode.getParent();
        
        }
            
            updateNode(parentNode , parent , true);
        
    }

    @Override
    public void treeNodesInserted(TreeModelEvent e) {
        
    }

    @Override
    public void treeNodesRemoved(TreeModelEvent e) {
       
    }

    @Override
    public void treeStructureChanged(TreeModelEvent e) {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    

    

    private void updateNode(DefaultMutableTreeNode parentNode, DefaultMutableTreeNode s, boolean b) {
    
        
        
        
        treemodel.insertNodeInto(parentNode, s, parentNode.getChildCount());
        if(b)
        {
            tree.scrollPathToVisible(new TreePath(parentNode.getPath()));
        }
        
        String str = parentNode.toString();
        
        createNodes(rootNode , str);
        
       
    }

    

    
}

[naved momin]

naved momin wrote:i need your help guyz i have coded a program with Jtree which is just displaying two nodes and 2 leaf nodes in one node and one is root
and also i have implemented a code within that to change the name of any leaf node dynamically means user can change the name as per his needs
till now it works fine , i mean the code does his job well by allowing to edit the nodes and rename them , but problem occurs when i restart that application the earlier modifications are just lost
and that was very easy to catch it was happening because i was filling the tree with the hard coded values from the constructor ...but i need to know how to replace my modified value with the hard coded ones because at any cost i need to fill the tree at start up so that user can see all its files
but how is this possible to retrieve the last change and replace it when we are filling the tree at start up so that our users can see the modified name of any file ?

code is

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package jtreedemo;


public class EditableTreeDemo implements  TreeModelListener{

 
    
    JFrame frm;
    JPanel panel;
    JTree tree;
     JLabel label;
     
  
     DefaultTreeModel treemodel;
     DefaultMutableTreeNode catogary ;
        DefaultMutableTreeNode book ;
        DefaultMutableTreeNode rootNode;
    public void  JTreeDemo() {
        frm = new JFrame("Tree");
        panel = new JPanel();
         rootNode = new DefaultMutableTreeNode("Root");
        treemodel = new DefaultTreeModel(rootNode);
        
        treemodel.addTreeModelListener(this);
        
        createNodes(rootNode , null);
        
        tree = new JTree(treemodel);

        tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
        
        
        JScrollPane treescroll = new JScrollPane(tree);
        
        Dimension size = new Dimension(900,800);
        
        tree.setMinimumSize(size);
        panel.setMinimumSize(size);
       
        
        
        
        
        tree.setEditable(true);
        
        tree.setShowsRootHandles(true);
        
        tree.setRootVisible(true);
        panel.add(treescroll);
        frm.add(panel , BorderLayout.CENTER);
        frm.pack();
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frm.setVisible(true);
        
        
        
    }
    
    
    public static void main(String[] args) {
        // TODO code application logic here
        new EditableTreeDemo().JTreeDemo();
    }

    private void createNodes(DefaultMutableTreeNode top , String update) {
        

        
        
            catogary = new DefaultMutableTreeNode("java string");
            top.add(catogary);
        
        
        
        
        
        book = new DefaultMutableTreeNode("ho");
        catogary.add(book);
        
        book = new DefaultMutableTreeNode("JFS.pdf");
        catogary.add(book);
        
        
        
        
        
    }

   

    @Override
    public void treeNodesChanged(TreeModelEvent e) {
        
        
        
        DefaultMutableTreeNode node ;
        node = (DefaultMutableTreeNode)(e.getTreePath().getLastPathComponent());
        
        
        
        int index = e.getChildIndices()[0];
        
        node = (DefaultMutableTreeNode) node.getChildAt(index);
        
        TreePath parentpath = tree.getSelectionPath();
        System.out.println(parentpath);
        DefaultMutableTreeNode parentNode  = null;
        
        
        
        
          DefaultMutableTreeNode parent = null;
        if(parentpath == null)
        {
            
        }
        else
        {
            parentNode = (DefaultMutableTreeNode) parentpath.getLastPathComponent();
            parent = (DefaultMutableTreeNode) parentNode.getParent();
        
        }
            
            updateNode(parentNode , parent , true);
        
    }

    @Override
    public void treeNodesInserted(TreeModelEvent e) {
        
    }

    @Override
    public void treeNodesRemoved(TreeModelEvent e) {
       
    }

    @Override
    public void treeStructureChanged(TreeModelEvent e) {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    

    

    private void updateNode(DefaultMutableTreeNode parentNode, DefaultMutableTreeNode s, boolean b) {
    
        
        
        
        treemodel.insertNodeInto(parentNode, s, parentNode.getChildCount());
        if(b)
        {
            tree.scrollPathToVisible(new TreePath(parentNode.getPath()));
        }
        
        String str = parentNode.toString();
        
        createNodes(rootNode , str);
        
       
    }

    

    
}

done solved