Moving expanded tree nodes in a JTree

Hello.
I have built a JTree that represents my hard disks. The files are sorted alphabetically. I already have built methods to create and remove directories, using the removeNodeFromParent and insertNodeInto methods in DefaultTreeModel.
Now I would like to rename a directory, so (because of the sorting) sometimes nodes should move some indices up or down. When I use the methods mentioned above it just works okay, but when I have expanded the node to be renamed it and all of its children get collapsed.
My question is: does anyone know of a convenient method to use for this problem? Thanks in advance.
Kind regards, Levi.

Hello guys,
thanks for all your replies. I've figured it out myself (not with the tree API, though) using two recursive methods.
Kind regards,
Levi

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I have followed this example to expand the nodes with a clic on the tree :
[http://www.oracle.com/technetwork/developer-tools/adf/learnmore/20-expand-tree-node-from-label-169156.pdf]
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JSPX:
<af:resource type="javascript" source="js/glasspane.js"/>
<af:tree value="#{bindings.OpcionesPadreView1.treeModel}" var="node"
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Edited by: Miguel Angel on 21/06/2012 12:53 PM

At least the call the javascript works, but this line doesn't work, anybody know why?:
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Hi Experts,
Working jdev 11.1.1.3.0.
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Hi,
Hope followings useful
http://andrejusb.blogspot.com/2010/02/how-to-traverse-adf-tree.html
http://www.oracle.com/technetwork/developer-tools/adf/learnmore/20-expand-tree-node-from-label-169156.pdf
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Take a look at Lilya Jsf Widgets and Ajax Capabilities at http://qlogic.ma/lilya
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Hi all,
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DECLARE
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Using node_depth you would change
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Expanding Tree nodes in Web Dynpro

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Hi Harshada
It looks strange to me that you use two main nodes on the first level. In the most cases it's enough to have only one node for each level of a tree.
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duplicate
How to get a Tree Node Value when a Tree is Expanded

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Here are the skin seletors
tr:tree Component
Icon Selectors
Name      Description
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af|tree::collapsed-icon      This icon is displayed before the collapsed tree node.
af|tree::no-children-icon      This icon is displayed instead of the expanded/collapsed icon, when the node has no children
af|tree::line-icon      This icon is used as a vertical line between the nodes.
af|tree::line-middle-icon      This icon is used as the horizontal line in the background of the expand/collapse icon of the node, in the case the node is not the last sibling of its parent node.
af|tree::line-last-icon      This icon is used as the horizontal line in the background of the expand/collapse icon of the node, in the case the node is the last sibling of its parent node.
af|tree::node-icon      This icon selector is used in the case the Node class has a getNodeType() method that returns the node type as string. The nodetype gets added to this selector, separated by a ':'. If the node is a container (has children) the following suffixes get added depending on the expanded/collapsed state: '-expanded' / '-collapsed'. e.g. "af|tree::node-icon:container-collapsed", "af|tree::node-icon:container-expanded", "af|tree::node-icon:noncontainer".
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Hi there,
Given a TreePath object, I need to know how to programmatically select a tree node on a JTree.
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I have a simple text editor project which has a JTree on its interface representing the local file system. The program has a SaveAs dialog box which also has a duplicate JTree as the one on the main interface (directories only). As the user selects the directory in which they wish to save the open file in the SaveAs dialog box, I need somehow to programmatically cause the JTree on the main interface to correspondingly select the same directory. How is this done?
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Please advise,
Alan
public void createLeafNode()
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Yes, I've tried setSelectionPath(TreePath path) numerous times, but it does nothing to select the node on the tree! You can see from the code I submitted that it is there commented out.
Ordinarily, when you click on a node on the tree it becomes the "active" node, evident because it becomes highlighted. But when I use setSelectionPath(TreePath path) method, giving it the path it needs, the node on the tree doesn't become the "active" node, therefore, not selected! Furthermore and subsequently, the rest of the code in the method createLeafNode() doesn't add a new node to the tree in the location specified by the TreePath object!
If you have used setSelectionPath(TreePath path) before successfully I would be interested in seeing a small sample program demonstrating its use. It would have to prove to me that you can select a node in the tree without physically clicking on any node in the tree with the mouse cursor, and add a new child node to that selected node.
I submit to you a small test program I put together that demonstrates the "typical setup". It requires the user to physically click on a node of the tree, then click on a button that adds a new node in the location of the selected node. If you can alter this program demonstrating that you can add a new node to the tree without my having to click on any node of the tree with my cursor, then I'll assign you the Duke Dollars and be forever humbled by your programming prowess.
Thanks for keeping on top of this thread as I've tried everything I can think of to try and make my program work. If you need to ask any questions please ask away. Perhaps there is something about my program that I've not explained yet that you're not aware of that I should have included. At this point I can't see the forest for the trees.
Alan
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JTree;
import javax.swing.event.*;
import javax.swing.tree.*;
public class AddNodeExample extends JFrame implements ActionListener
JTree jTree1 = null;
DefaultTreeModel model = null;
DefaultMutableTreeNode rootNode = null;
JScrollPane jScrollPane1 = null;
JLabel status = new JLabel("Status:");
TreePath path = null;
JButton add = new JButton("Add new node");
public static void main(String[] args)
    AddNodeExample example = new AddNodeExample();
    example.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
public AddNodeExample()
    super("Add Node To JTree Example");
    setSize(400, 300);
    jScrollPane1 = new JScrollPane();
    add.addActionListener(this);
    DefaultMutableTreeNode[] boys = new DefaultMutableTreeNode[6];
    boys[0] = new DefaultMutableTreeNode("Harry");
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    boys[2] = new DefaultMutableTreeNode("Jake");
    boys[3] = new DefaultMutableTreeNode("Brian");
    boys[4] = new DefaultMutableTreeNode("Alan");
    boys[5] = new DefaultMutableTreeNode("Guy");
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    girls[0] = new DefaultMutableTreeNode("Debbie");
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    girls[2] = new DefaultMutableTreeNode("Sally");
    girls[3] = new DefaultMutableTreeNode("Jessica");
    girls[4] = new DefaultMutableTreeNode("MoonUnit");
    girls[5] = new DefaultMutableTreeNode("Sara");
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    DefaultMutableTreeNode Boys = new DefaultMutableTreeNode("Boys");
    DefaultMutableTreeNode Girls = new DefaultMutableTreeNode("Girls");
    //Fill up the node for boys
    for(int i = 0; i < boys.length; i++)
      Boys.add(boys);
//Fill up the node for girls
for(int i = 0; i < girls.length; i++)
Girls.add(girls[i]);
//add Boys and Girls to rootNode
rootNode.add(Boys);
rootNode.add(Girls);
model = new DefaultTreeModel(rootNode);
jTree1 = new JTree(model);
jTree1.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
jTree1.putClientProperty("JTree.lineStyle", "Angled");
jTree1.addTreeSelectionListener(new TreeSelectionListener()
public void valueChanged(TreeSelectionEvent event)
     path = event.getPath();
DefaultMutableTreeNode node = getTreeNode(path);
status.setText("Selected: " + (String)node.getUserObject());
jScrollPane1.getViewport().add(jTree1, null);
getContentPane().add(jScrollPane1, BorderLayout.CENTER);
getContentPane().add(add, BorderLayout.NORTH);
getContentPane().add(status, BorderLayout.SOUTH);
setVisible(true);
public DefaultMutableTreeNode getTreeNode(TreePath path)
return (DefaultMutableTreeNode)(path.getLastPathComponent());
public void actionPerformed(ActionEvent e)
jTree1.repaint();
if (path == null || path.getPathCount() < 1)
     return;
DefaultMutableTreeNode treeNode = getTreeNode(path);
DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("My New Node");
treeNode.add(newNode);
model.nodeStructureChanged(treeNode);
path = path.pathByAddingChild(newNode);
jTree1.scrollPathToVisible(path);

Drop on a Tree Node - Help!

On a drop on a tree node, I'd like to get the item that is
being dropped on.
Tree object being dropped on: event.currentTarget
Index of node in tree being dropped on:
event.currentTarget..calculateDropIndex(event); where event is the
DragEvent
dropTarget is a great name for a method that would do this,
but it returns a display object.
Some ideas:
1. Use the index to somehow go through the XML data provider.
I don't think this is the right way - the XML structure is not list
based.
2. The Tree creates a list from the XML. How can I leverage
that and get the item for a given node index? dropTarget seems like
the right term, but it returns a display object.
3. tree.selectedItem and tree.Selected Items return null and
an array of null, so I can't use that either.

Hello Brian,
thanks for your reply.
The benefit of focusing a node in the tree is the following:
If a person only uses the keyboard to navigate (e.g. because of him/her being blind) expands a tree node, he expects the focus still being on the expanded tree node afterwards. But if a roundtrip to the server happens (because of a executed onClick-event) the focus after the reload is at the beginning of the page again. Thus the blind person hast to TAB through the whole page again until he reaches the tree node he has expanded.
I use the com.sapportals.htmlb.* package for the htmlb-elements.
Almost all elements are underclasses of com.sapportals.htmlb.Component, but Treenode is not.
I use a model to create tree nodes. TreeNodes are created like this in the Model:
mComponentsNode = new TreeNode(COMP_NODE_ID);
mComponentsNode.setComponent(new TextView(COMP_NODE_TEXT));
mComponentsNode.setOnNodeClick(MODE_ON_CLICK_EVENT);
mComponentsNode.setOnNodeExpand(TREE_NODE_EXPAND_EVENT);
mComponentsNode.setOnNodeClose(TREE_NODE_CLOSE_EVENT);
mComponentsNode.setTooltip(COMP_NODE_TOOLTIP);
mComponentsNode.setOpen(true);
mHomeNode.addChildNode(mComponentsNode);
In the JSP the tree is created like this:
<hbj:tree id="configTree"
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    rootNode="configTree"
    rootNodeIsVisible="false">
</tree>
Do you have any idea?
Thanks!
Regards,
Bastian

How do i expand all the nodes in a jtree

Hi,
I am working on a project where i need to expand all the nodes of a jtree i have tried a few different ways but it never seems to expand all the nodes..
I would be very greatful if someone could point me in the right direction
cheers
Mary

you could use the following method that expands nodes recursively
expandNode( myTree, myRootNode, new TreePath( myRootNode ) );
public static void expandNode( JTree tree, TreeNode node, TreePath path ) {
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Help with building a JTree using tree node and node renderers

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import java.net.*;
import java.io.*;
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import javax.swing.tree.*;
import javax.swing.*;
*this class implements the spider.
public class WebSpider extends HTMLEditorKit
     *make a collection of the URL's
     protected Collection urlErrors = new ArrayList(3);
     protected Collection urlsWaiting = new ArrayList(3);
     protected Collection urlsProcessed = new ArrayList(3);
     //report URL's to this class
     protected gui report;
     *this flag will indicate whether the process
     *is to be cancelled
     protected boolean cancel = false;
     *The constructor
     *report the urls to the wui class
     public WebSpider(gui report)
     this.report = report;
     *get the urls from the above declared
     *collections
     public Collection getUrlErrors()
     return urlErrors;
     public Collection getUrlsWaiting()
     return urlsWaiting;
     public Collection getUrlsProcessed()
     return urlsProcessed;
     * Clear all of the collections.
     public void clear()
     getUrlErrors().clear();
     getUrlsWaiting().clear();
     getUrlsProcessed().clear();
     *Set a flag that will cause the begin
     *method to return before it is done.
     public void cancel()
     cancel = true;
     *add the entered url for porcessing
     public void addURL(URL url)
     if (getUrlsWaiting().contains(url))
          return;
     if (getUrlErrors().contains(url))
          return;
     if (getUrlsProcessed().contains(url))
          return;
     /*WRITE TO LOG FILE*/
     log("Adding to workload: " + url );
     getUrlsWaiting().add(url);
     *process a url
     public void processURL(URL url)
     try
          /*WRITE TO LOGFILE*/
          log("Processing: " + url );
          // get the URL's contents
          URLConnection connection = url.openConnection();
          if ((connection.getContentType()!=null) &&
     !connection.getContentType().toLowerCase().startsWith("text/"))
          getUrlsWaiting().remove(url);
          getUrlsProcessed().add(url);
          log("Not processing because content type is: " +
     connection.getContentType() );
               return;
     // read the URL
     InputStream is = connection.getInputStream();
     Reader r = new InputStreamReader(is);
     // parse the URL
     HTMLEditorKit.Parser parse = new HTMLParse().getParser();
     parse.parse(r,new Parser(url),true);
catch (IOException e)
     getUrlsWaiting().remove(url);
     getUrlErrors().add(url);
     log("Error: " + url );
     report.URLError(url);
     return;
// mark URL as complete
getUrlsWaiting().remove(url);
getUrlsProcessed().add(url);
log("Complete: " + url );
*start the spider
public void run()
cancel = false;
while (!getUrlsWaiting().isEmpty() && !cancel)
     Object list[] = getUrlsWaiting().toArray();
     for (int i=0;(i<list.length)&&!cancel;i++)
     processURL((URL)list);
* A HTML parser callback used by this class to detect links
protected class Parser extends HTMLEditorKit.ParserCallback
protected URL urlInput;
public Parser(URL urlInput)
this.urlInput = urlInput;
public void handleSimpleTag(HTML.Tag t,MutableAttributeSet a,int pos)
String href = (String)a.getAttribute(HTML.Attribute.HREF);
if((href==null) && (t==HTML.Tag.FRAME))
href = (String)a.getAttribute(HTML.Attribute.SRC);
if (href==null)
return;
int i = href.indexOf('#');
if (i!=-1)
href = href.substring(0,i);
if (href.toLowerCase().startsWith("mailto:"))
report.emailFound(href);
return;
handleLink(urlInput,href);
public void handleStartTag(HTML.Tag t,MutableAttributeSet a,int pos)
handleSimpleTag(t,a,pos); // handle the same way
protected void handleLink(URL urlInput,String str)
try
     URL url = new URL(urlInput,str);
if (report.urlFound(urlInput,url))
addURL(url);
catch (MalformedURLException e)
log("Found malformed URL: " + str);
*log the information of the spider
public void log(String entry)
System.out.println( (new Date()) + ":" + entry );
I have a seperate class for parseing the HTML. Any help would be greatly appreciated
mrv

Hi Sorry to be a pain again,
I have re worked the gui class so it looks like this now:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
     *declare variable, boolean
     *thread, a object and a center
     *pane
     protected URL urlInput;
     protected Thread bgThread;
     protected boolean run = false;
     protected WebSpider webSpider;
     public String msgInfo;
     public String brokenUrl;
     public String goodUrl;
     public String deadUrl;
     protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
     public gui()
          *create the gui here
          setTitle("Testing Tool");
     setSize(600,600);
     //add Buttons to the tool bar
     start.setText("Start");
     start.setActionCommand("Start");
     toolBar.add(start);
     ButtonListener startListener = new ButtonListener();
          start.addActionListener(startListener);
          cancel.setText("Cancel");
     cancel.setActionCommand("Cancel");
     toolBar.add(cancel);
     ButtonListener cancelListener = new ButtonListener();
          cancel.addActionListener(cancelListener);
          close.setText("Close");
     close.setActionCommand("Close");
     toolBar.add(close);
     ButtonListener closeListener = new ButtonListener();
          close.addActionListener(closeListener);
          //creat a simple form
          urlLabel.setText("Enter URL:");
          urlLabel.setBounds(100,36,288,24);
          formTab.add(urlLabel);
          url.setBounds(170,36,288,24);
          formTab.add(url);
          current.setText("Currently Processing: ");
          current.setBounds(100,80,288,24);
          formTab.add(current);
     //add scroll bars to the error messages screen and website structure
     errorPane.setAutoscrolls(true);
     errorPane.setHorizontalScrollBarPolicy(javax.swing.
     ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
     errorPane.setVerticalScrollBarPolicy(javax.swing.
     ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
     errorPane.setOpaque(true);
     errorTab.add(errorPane);
     errorPane.setBounds(0,0,580,490);
     errorText.setEditable(false);
     errorPane.getViewport().add(errorText);
     errorText.setBounds(0,0,600,550);
     treePane.setAutoscrolls(true);
     treePane.setHorizontalScrollBarPolicy(javax.swing.
     ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
     treePane.setVerticalScrollBarPolicy(javax.swing.
     ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
     treePane.setOpaque(true);
     treeTab.add(treePane);
     treePane.setBounds(0,0,580,490);
     treeText.setEditable(false);
     treePane.getViewport().add(treeText);
     treeText.setBounds(0,0,600,550);
     //JTree
     // NEW CODE
     rootNode = new DefaultMutableTreeNode("Root Node");
     treeModel = new DefaultTreeModel(rootNode);
     treeModel.addTreeModelListener(new MyTreeModelListener());
     tree = new JTree(treeModel);
     tree.setEditable(true);
     tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
     treeText.add(tree);
     //create the tabbed window
centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
          //add the tool bar and tabbed pane
          getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
          *create the tool bar pane, a center pane, add the buttons,
          *labels, tabs, a text field for user input here
          javax.swing.JPanel toolBar = new javax.swing.JPanel();
          javax.swing.JButton start = new javax.swing.JButton();
          javax.swing.JButton cancel = new javax.swing.JButton();
          javax.swing.JButton close = new javax.swing.JButton();
          javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
          javax.swing.JPanel formTab = new javax.swing.JPanel();
          javax.swing.JLabel urlLabel = new javax.swing.JLabel();
          javax.swing.JLabel current = new javax.swing.JLabel();
          javax.swing.JTextField url = new javax.swing.JTextField();
          javax.swing.JPanel errorTab = new javax.swing.JPanel();
          javax.swing.JTextArea errorText = new javax.swing.JTextArea();
          javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
          javax.swing.JPanel treeTab = new javax.swing.JPanel();
          javax.swing.JTextArea treeText = new javax.swing.JTextArea();
          javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
          javax.swing.JTree tree = new javax.swing.JTree();
          *show the gui
          public static void main(String args[])
          (new gui()).setVisible(true);
     *listen for the button presses and set the
     *boolean flag depending on which button is pressed
     class ButtonListener implements ActionListener
          public void actionPerformed(ActionEvent event)
               Object object = event.getSource();
               if (object == start)
                    run = true;
                    startActionPerformed(event);
               if (object == cancel)
                    run = false;
                    startActionPerformed(event);
               if (object == close)
                    System.exit(0);
     *this method is called when the start or
     *cancel button is pressed.
     void startActionPerformed (ActionEvent event)
          if (run == true && bgThread == null)
               bgThread = new Thread(this);
               bgThread.start();
               //new line of code
               treeText.addObject(msgInfo);
          if (run == false && bgThread != null)
               webSpider.cancel();
     *this mehtod will start the background thred.
     *the background thread is required so that the
     *GUI is still displayed
     public void run()
          try
               webSpider = new WebSpider(this);
               webSpider.clear();
               urlInput = new URL(url.getText());
               webSpider.addURL(urlInput);
               webSpider.run();
               bgThread = null;
          catch (MalformedURLException e)
               addressError addErr = new addressError();
               addErr.addMsg = "URL ERROR - PLEASE CHECK";
               SwingUtilities.invokeLater(addErr);
          *this method is called by the web spider
          *once a url is found. Validation of navigation
          *happens here.
          public boolean urlFound(URL urlInput,URL url)
               CurrentlyProcessing pro = new CurrentlyProcessing();
          pro.msg = url.toString();
          SwingUtilities.invokeLater(pro);
          if (!testLink(url))
                    navigationError navErr = new navigationError();
                    navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
                    brokenUrl = url.toString();
                    return false;
          if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
               return false;
          else
               return true;
          *this method is returned if there is no link
          *on a web page, e.g. there us a dead end
          public void urlNotFound(URL urlInput)
                    deadEnd dEnd = new deadEnd();
                    dEnd.dEMsg = "No links on "+urlInput+"\n";
                    deadUrl = urlInput.toString();
          *this method is called internally to check
     *that a link works
          protected boolean testLink(URL url)
          try
               URLConnection connection = url.openConnection();
               connection.connect();
               goodUrl = url.toString();
               return true;
          catch (IOException e)
               return false;
     *this method is called when an error is
     *found.
          public void urlError(URL url)
          *this method is called when an email
          *address is found
          public void emailFound(String email)
          /*this method will update any errors found inc
          *address errors and broken links
          class addressError implements Runnable
               public String addMsg;
               public void run()
                    current.setText("Currently Processing: "+ addMsg);
                    errorText.append(addMsg);
          class navigationError implements Runnable
               public String navMsg;
               public void run()
                    errorText.append(navMsg);
          class deadEnd implements Runnable
               public String dEMsg;
               public void run()
                    errorText.append(dEMsg);
          *this method will update the currently
          *processing field on the GUI
          public class CurrentlyProcessing implements Runnable
               public String msg;
          //new line
          public String msgInfo = msg;
          public void run()
               current.setText("Currently Processing: " + msg );
     * NEW CODE
     * NEED THIS CODE SOMEWHERE
     * treeText.addObject(msgInfo);
     public DefaultMutableTreeNode addObject(Object child)
     DefaultMutableTreeNode parentNode = null;
     TreePath parentPath = tree.getSelectionPath();
     if (parentPath == null)
     parentNode = rootNode;
     else
     parentNode = (DefaultMutableTreeNode)
(parentPath.getLastPathComponent());
     return addObject(parentNode, child, true);
     public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child)
     return addObject(parent, child, false);
     public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
     Object child,boolean shouldBeVisible)
     DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(child);
     if (parent == null)
     parent = rootNode;
     treeModel.insertNodeInto(childNode, parent, parent.getChildCount());
     if (shouldBeVisible)
     tree.scrollPathToVisible(new TreePath(childNode.getPath()));
          return childNode;
     public class MyTreeModelListener implements TreeModelListener
          public void treeNodesChanged (TreeModelEvent e)
               DefaultMutableTreeNode node;
               node = (DefaultMutableTreeNode)
               (e.getTreePath().getLastPathComponent());
               try
                    int index = e.getChildIndices()[0];
                    node = (DefaultMutableTreeNode)
                    (node.getChildAt(index));
               catch (NullPointerException exc)
          public void treeNodesInserted(TreeModelEvent e)
          public void treeStructureChanged(TreeModelEvent e)
          public void treeNodesRemoved(TreeModelEvent e)
I beleive that this line of code is required:
treeText.addObject(msgInfo);
I have placed it where the action events start the spider, but i keep getting this error:
cannot resolve symbol
symbol : method addObject (java.lang.String)
location: class javax.swing.JTextArea
treeText.addObject(msgInfo);
Also the jtree is not showing the window that I want it to and I am not too sure why. could you have a look to see why? i think it needs a fresh pair of eyes.
Many thanks
MrV

How to cut, copy and paste a tree node in JTree?????

Hi, Java GUI guru. Thank you for your help in advance.
I am working on a File Explorer project with JTree. There are cut, copy and paste item menus in my menu bar. I need three EventAction methods or classes to implements the three tasks. I tried to use Clipboard to copy and paste tree node. But I can not copy any tree node from my tree.
Are there any body has sample source code about cut, copy, and paste for tree? If possible, would you mind send me your sample source code to [email protected]
I would appreciate you very very much for your help!!!!
X.G.

Hi, Paul Clapham:
Thank you for your quick answer.
I store the node in a DefaultMutableTreeNode variable, and assign it to another DefaultMutableTreeNode variable. I set up two classes (CopyNode and PasteNode). Here they are as follows:
//CopyNode class
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class CopyNode implements ActionListener{
private TreeList jtree;
String treeNodeName;
TreePath currentSelection;
DefaultMutableTreeNode currentNode;
public CopyNode(TreeList t){
jtree = t;
public void actionPerformed(ActionEvent e){
currentSelection = jtree.tree.getSelectionPath();
if(currentSelection != null){
currentNode = (DefaultMutableTreeNode)(currentSelection.getLastPathComponent());
treeNodeName = currentNode.toString();
//PasteNode class
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class PasteNode extends DefaultMutableTreeNode{
private TreeList jtree;
CopyNode copyNode;
public PasteNode(TreeList t){
jtree = t;
copyNode = new CopyNode(t);
public DefaultMutableTreeNode addObject(Object child){
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = jtree.tree.getSelectionPath();
if(parentPath == null){
parentNode = jtree.root;
else{
parentNode = (DefaultMutableTreeNode)parentPath.getLastPathComponent();
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent, Object child, boolean shouldBeVisible){
DefaultMutableTreeNode childNode = copyNode.currentNode;
if(parent == null){
parent = jtree.root;
jtree.treemodel.insertNodeInto(childNode, parent, parent.getChildCount());
if(shouldBeVisible){
jtree.tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
I used these two classes objects in "actionPerformed(ActionEvent e)" methods in my tree:
//invoke copyNode
copyItem = new JMenuItem("Copy");
copyItem.addActionListener(copyNode);
//invoke pasteNode
pasteItem = new JMenuItem("Paste");
pasteItem.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
pasteName.addObject(copyName.treeNodeName);
When I run the drive code, making a copy some node from my tree list, I got bunch of error messages.
Can you figour out what is wrong in my two classes? If you have sample code, would you mind mail me for reference.
Thank you very much in advance.
X.G.

JTree and selected tree node

I am allowing the user to search for a node in a JTree. I can find the node and progamatically expand and select the node. What I would like to do next is find the x,y coordinates of this selected node so I can use Robot to move the mouse to this node. I have hover help which is chock full of information in HTML describing this node, however, the user now is required to move the cursor to this selected node to see the hover help.
Any help would be appreciated.

Hi ,
try this
jlabel.setIcon( null ) ;

Moving expanded tree nodes in a JTree

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