JTree SINGLE_TREE_SELECTION
This doesn't work if user holds the mouse button down and drags up or down the tree? Anyone seen this problem before?
It's ok! JTree in JTable - had to select single selection for both objects...
Similar Messages
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Help with building a JTree using tree node and node renderers
Hi,
I am having a few problems with JTree's. basically I want to build JTree from a web spider. The webspide searches a website checking links and stores the current url that is being processed as a string in the variable msg. I wan to use this variable to build a JTree in a new class and then add it to my GUI. I have created a tree node class and a renderer node class, these classes are built fine. can someone point me in the direction for actually using these to build my tree in a seperate class and then displaying it in a GUI class?
*nodeRenderer.java
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.net.*;
public class nodeRenderer extends DefaultTreeCellRenderer
implements TreeCellRenderer
public static Icon icon= null;
public nodeRenderer() {
icon = new ImageIcon(getClass().getResource("icon.gif"));
public Component getTreeCellRendererComponent(
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) {
super.getTreeCellRendererComponent(
tree, value, sel,
expanded, leaf, row,
hasFocus);
treeNode node = (treeNode)(((DefaultMutableTreeNode)value).getUserObject());
if(icon != null) // set a custom icon
setOpenIcon(icon);
setClosedIcon(icon);
setLeafIcon(icon);
return this;
*treeNode.java
*this is the class to represent a node
import javax.swing.*;
import javax.swing.tree.*;
import java.util.*;
import java.net.*;
* Class used to hold information about a web site that has
* been searched by the spider class
public class treeNode
*Url from the WebSpiderController Class
*that is currently being processed
public String msg;
treeNode(String urlText)
msg = urlText;
String getUrlText()
return msg;
//gui.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
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 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);
//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 searchTree = 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();
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";
return false;
if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
return false;
else
return true;
*this method is called internally to check
*that a link works
protected boolean testLink(URL url)
try
URLConnection connection = url.openConnection();
connection.connect();
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()
errorText.append(addMsg);
current.setText("Currently Processing: "+ addMsg);
class navigationError implements Runnable
public String navMsg;
public void run()
errorText.append(navMsg);
*this method will update the currently
*processing field on the GUI
class CurrentlyProcessing implements Runnable
public String msg;
public void run()
current.setText("Currently Processing: " + msg );
//webspider.java
import java.util.*;
import java.net.*;
import java.io.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
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
mrvHi 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 -
Hi there,
I need to do a simple thing with a JTree but I 've got a problem. Well I want to create a very very very simple bookmark function. I have a tree with the children and I want to add new children which are going to work like link for my program. I try to add new children the same way I created them but it's not working. I tried also the updateUI method that somebody mentioned in an other topic but still nothing. Can somebody help?
Here is the Bookmark Panel code:
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.awt.*;
public class BookmarkTry implements TreeSelectionListener {
private JScrollPane scrollPane;
private JLabel label;
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Bookmarks");
private JTree tree;
private JPanel panel = new JPanel();
public BookmarkTry(){
public JPanel createpanel(){
tree = new JTree(root);
root.add(new DefaultMutableTreeNode(new Bookmark("Chapter 1","about.html")));
root.add(new DefaultMutableTreeNode(new Bookmark("Chapter 2","aaa.html")));
root.add(new DefaultMutableTreeNode(new Bookmark("Chapter 3","sdss.html")));
// build tree
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.addTreeSelectionListener(this);// get selection events!
// build form
scrollPane = new JScrollPane(tree);
label = new JLabel(" ");
//scrollPane.setViewportView(tree);
panel.add(label);
panel.add(scrollPane);
return panel;
public void addBookMarks(String name, String page){
root.add(new DefaultMutableTreeNode(new Bookmark(name,page)));
//DefaultTreeModel.reload();
public void valueChanged(TreeSelectionEvent treeSelectionEvent) {
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if ((selectedNode!=null)&&(selectedNode.isLeaf())) {
Bookmark b = (Bookmark)selectedNode.getUserObject();
label.setText("Go to page "+b.getPage());
private static class Bookmark {
private String caption;
private String page;
public String getPage() {
return page;
public Bookmark(String caption, String page) {
this.caption = caption;
this.page = page;
public String toString() {
return caption;
and here how I try to add the node :
void jButton1_actionPerformed(ActionEvent e) throws java.sql.SQLException {
DefaultMutableTreeNode book = null;
System.out.println("You pressed the add button of bookmarkframe");
//Bookmark.getTreePanel().addObject(name.getText());
//book = new DefaultMutableTreeNode(new BookInfo(name.getText(),page.getText()));
System.out.println(name.getText());
System.out.println(page.getText());
tempb.addBookMarks(name.getText(),page.getText());
frame.dispose();
} //void jButton1_actionPerformedIt doesn't add the new node in my JTree
Thanks in advanceI still suspect you have two (or more) new BookmarkTry() executions somewhere. But I can't see all of your code here of course. My standard reply, so we don't waste time guessing:
1) In the future, Swing related questions should be posted in the Swing forum.
2) If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program (SSCCE) that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
And don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the code retains its original formatting.
Note, we don't want your whole application. We want an SSCCE! -
Hi,
I have developed a webspider that cycles through a website detecting all urls and checking for borken links. I currently have build a JTree that takes the current url that is being processed and creates a string and adds it to a JTree. The problem I have is that the urls are printed in the JTree as one long list, e.g.
|Test
|____url 1
|____url 1a
|____url 2
|____url 2a
I would like it to disply like this:
|Test
|____url 1
|-------|____url 1a
|____url 2
|-------|____url 2a
(I have had to place the dashes in so it displays properly)
So that the strucutre of the website can be seen. I have read the JTree tutroial and my code looks like this, sorry its large i'm not too sure which bits to cut out:
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 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);
clear.setText("Clear");
clear.setActionCommand("Clear");
toolBar.add(clear);
ButtonListener clearListener = new ButtonListener();
clear.addActionListener(clearListener);
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 the scrol pane and text area to the error tab
errorTab.add(errorPane);
errorPane.setBounds(0,0,580,490);
errorPane.getViewport().add(errorText);
//add the scroll pane to the tree tab
treeTab.add(treePane);
treePane.setBounds(0,0,580,490);
//create the JTree
rootNode = new DefaultMutableTreeNode("Test");
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);
treePane.getViewport().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 clear = 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.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 == clear)
errorText.setText("");
rootNode.removeAllChildren();
treeModel.reload();
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();
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
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 navigation errors found
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;
//public String msgInfo = msg;
public void run()
current.setText("Currently Processing: " + msg );
addObject(msg);
//add a node to the tree
public DefaultMutableTreeNode addObject (Object child)
DefaultMutableTreeNode parentNode = null;
return addObject(parentNode, child, true);
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;
//listener for the tree model
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)
}It uses a class called webspider which i have not attached, if required please let me know. I beleive that in addObject I am adding all nodes to the root as children.
Any help would be much appreciated.
Many Thanks
MRvI would recomend you create your own JTree class for this.
Here are a few things I set in my constructor within the JTree:
// turn on tooltips
ToolTipManager.sharedInstance().registerComponent(this);
// used by two setters so create reference
RollupTreeCellRenderer renderer = new RollupTreeCellRenderer();
// customizing the icons for the tree
// setting the folder icons
renderer.setOpenIcon(IconLoader.getIcon("Open.gif"));
renderer.setClosedIcon(IconLoader.getIcon("Folder.gif"));
// inventory icon
renderer.setLeafIcon(IconLoader.getIcon("Document.gif"));
// add renderer to highlight Inventory nodes with Red or Blue text
setCellRenderer(renderer);
Here is the renderer class example:
class RollupTreeCellRenderer
extends DefaultTreeCellRenderer
* Configures the renderer based on the passed in components.
* The value is set from messaging the tree with
* <code>convertValueToText</code>, which ultimately invokes
* <code>toString</code> on <code>value</code>.
* The foreground color is set based on the selection and the icon
* is set based on on leaf and expanded.
* @param tree JTree
* @param value Object
* @param sel boolean
* @param expanded boolean
* @param leaf boolean
* @param row int
* @param hasFocus boolean
* @return Component
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean sel,
boolean expanded,
boolean leaf, int row,
boolean hasFocus)
// call super for default behavior
super.getTreeCellRendererComponent(tree,
value,
sel,
expanded,
leaf,
row,
hasFocus);
// if the current node is selected do NOT over-ride
// the default colors
if (sel)
return this;
// cast to our wrapper Node class
RollupNode node = (RollupNode) value;
if (node.isInventory())
if (RollupMediator.getInstance().nodeInList(node))
setForeground(RollupTree.FOUND);
setToolTipText("Click to find positions count");
else
setForeground(RollupTree.NOT_FOUND);
setToolTipText("Inventory not in current business date");
else
setToolTipText("Double click to edit name");
return this;
} // Renderer
Let me know if you need more examples.
BTW
I the TreeCellRenderer example is not public so I can add it to the bottom of the file that contains my custom JTree. -
Hi all of you there!
I made a JTree from my local disk (c:/) en in that JTree I can navigate through al the folders of my C-disk.
Now I want to have the directory of the file that is highlighted. I already try lot of things but no one work.
The best thing I get was: "nodeinfo = [Ljavax.swing.tree.TreeNode;@110c31"
{code}
private JScrollPane getFileScrollPane(String file) {
if (fileScrollPane == null) {
fileScrollPane = new JScrollPane();
fileScrollPane.setPreferredSize(new Dimension(200, 400));
File root;
FileTreeModel model;
//JTree tree;
root = (new File(file));
model = (new FileTreeModel(root));
tree = new JTree();
tree.setModel(model);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.addTreeSelectionListener(tree);
tree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode node = new DefaultMutableTreeNode();
tree.getLastSelectedPathComponent();
/* if nothing is selected */
if (node == null)
return;
/* retrieve the node that was selected */*
Object nodeInfo = node.getPath();
//Object nodeInfo = node.getUserObject();
System.out.println("nodeinfo = " + nodeInfo);
System.out.println("root=" + node.getParent());
fileScrollPane = new JScrollPane(tree);
fileScrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
fileScrollPane.setPreferredSize(new Dimension(315, 300));
return fileScrollPane;
}{code}
the String file contains "c:/"
I hope that someone can help meHi, thanks for your help!
But it won't work.
Now I get the following error: (I paste everything in here, maybe someone wants to see it all)
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.io.File cannot be cast to javax.swing.tree.DefaultMutableTreeNode
at main.Main$10.valueChanged(Main.java:553)
at javax.swing.JTree.fireValueChanged(Unknown Source)
at javax.swing.JTree$TreeSelectionRedirector.valueChanged(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(Unknown Source)
at javax.swing.JTree.setSelectionPath(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source) -
I've tried everything I can think of, but the JTree never updates properly.
Here's an example of what's going on.
I have a JTree that uses Drag and Drop. I have 2 folders in the C:\ drive. They are C:\NewFolder1 and C:\NewFolder2
I open Windows Explorer and drag C:\NewFolder1 into my JTree, dropping it in C:\NewFolder2
Windows Explorer shows it now as C:\NewFolder2\NewFolder1, however my bastard JTree never changed. When I try to refresh the JTree, I can get the JTree to collapse itself, but when I re-expand it, it is the same old structure.
Below is the relevant portions of code... Any suggestions?
// ------------------TREE CREATION-------- //
DFM = new DefaultTreeModel( getRoot() ); //The Default Tree Model
tree = new JTree( DFM );
tree.setToggleClickCount(1);
tree.setCellRenderer( new MyTreeRenderer() );
tree.getSelectionModel().setSelectionMode( TreeSelectionModel.SINGLE_TREE_SELECTION ); //set single selection for the Tree
tree.addTreeSelectionListener( new TreeSelectionListener()
public void valueChanged( TreeSelectionEvent e )
DefaultMutableTreeNode node = ( DefaultMutableTreeNode ) tree.getLastSelectedPathComponent();
getChildren( node );
scrollPane1.getViewport().add( tree, null );
// Should properly rebuild JTree //
public void refreshTree()
DFM.reload( getRoot() ); //getRoot() returns a DefaultMutableTreeNode
//tree.setModel(DFM);
//tree = new JTree(DFM);
//scrollPane1.removeAll();
//scrollPane1.getViewport().add( tree, null );
scrollPane1.revalidate();
scrollPane1.repaint();
}Below is my code...Maybe someone can spot something out of the ordinary?
package DND;
import jExplorer.DiskObject;
import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.*;
import java.io.File;
public class AutoscrollTree extends JTree implements Autoscroll, DragGestureListener, DragSourceListener
private static final int AUTOSCROLL_MARGIN = 25;
private Insets autoscrollInsets = new Insets( 0,0,0,0 ); // AutoScroll methods.
private DefaultTreeModel dtModel;
private DefaultMutableTreeNode root;
public AutoscrollTree( DefaultMutableTreeNode root )
super();
this.root = root;
dtModel = new DefaultTreeModel( root );
setModel( dtModel );
DragSource dragSource = DragSource.getDefaultDragSource();
dragSource.createDefaultDragGestureRecognizer(
this, // component where drag originates
DnDConstants.ACTION_COPY_OR_MOVE, // actions
this ); // drag gesture recognizer
new DropTarget( this, getTargetListener() );
// AUTO SCROLLING //
public void autoscroll( Point location )
{ //System.out.println("mouse at " + location);
int top = 0, left = 0, bottom = 0, right = 0;
Dimension size = getSize();
Rectangle rect = getVisibleRect();
int bottomEdge = rect.y + rect.height;
int rightEdge = rect.x + rect.width;
if( location.y - rect.y <= AUTOSCROLL_MARGIN && rect.y > 0 ) top = AUTOSCROLL_MARGIN;
if( location.x - rect.x <= AUTOSCROLL_MARGIN && rect.x > 0 ) left = AUTOSCROLL_MARGIN;
if( bottomEdge - location.y <= AUTOSCROLL_MARGIN && bottomEdge < size.height ) bottom = AUTOSCROLL_MARGIN;
if( rightEdge - location.x <= AUTOSCROLL_MARGIN && rightEdge < size.width ) right = AUTOSCROLL_MARGIN;
rect.x += right - left;
rect.y += bottom - top;
scrollRectToVisible( rect );
public Insets getAutoscrollInsets()
Dimension size = getSize();
Rectangle rect = getVisibleRect();
autoscrollInsets.top = rect.y + AUTOSCROLL_MARGIN;
autoscrollInsets.left = rect.x + AUTOSCROLL_MARGIN;
autoscrollInsets.bottom = size.height - ( rect.y + rect.height ) + AUTOSCROLL_MARGIN;
autoscrollInsets.right = size.width - ( rect.x + rect.width ) + AUTOSCROLL_MARGIN;
return autoscrollInsets;
// Drag Listeners //
public void dragGestureRecognized( DragGestureEvent e )
// drag anything ...
String directory = getDirectory();
e.startDrag( DragSource.DefaultCopyDrop, // cursor type
new StringSelection( directory ), // transferable
this ); // drag source listener
System.out.println( "Start: " + directory );
public void dragDropEnd( DragSourceDropEvent e )
String directory = getDirectory();
System.out.println( "End: " + directory );
public void dragEnter( DragSourceDragEvent e )
System.out.println( "Enter" );
public void dragExit( DragSourceEvent e )
System.out.println( "Exit" );
public void dragOver( DragSourceDragEvent e )
// System.out.println( "Over" );
public void dropActionChanged( DragSourceDragEvent e )
System.out.println( "Action Changed" );
// DROP LISTENERS //
public DropTargetListener getTargetListener()
DropTargetListener dtl = new DropTargetAdapter()
public void dragOver( DropTargetDragEvent dtde )
int x = dtde.getLocation().x;
int y = dtde.getLocation().y;
TreePath path = getClosestPathForLocation( x, y );
if( path != null )
setSelectionPath( path );
public void drop( DropTargetDropEvent dtde )
try
// Ok, get the dropped object and try to figure out what it is.
Transferable tr = dtde.getTransferable();
DataFlavor[] flavors = tr.getTransferDataFlavors();
for( int i = 0; i < flavors.length; i++ )
System.out.println( "Possible flavor: " + flavors.getMimeType() );
// Check for file lists specifically.
if( flavors[i].isFlavorJavaFileListType() )
// Great! Accept copy drops...
dtde.acceptDrop( DnDConstants.ACTION_COPY );
System.out.println( "Successful file list drop.\n\n" );
// And add the list of file names to our text area
java.util.List list =
( java.util.List ) tr.getTransferData( flavors[i] );
// Destination directory
String directory = getDirectory();
File dir = new File( directory );
for( int j = 0; j < list.size(); j++ )
// Source File
File file = (File)list.get(j);
// Move file to new directory
boolean success = file.renameTo(new File(dir, file.getName()));
if (success)
System.out.println( "Moved "+list.get(j) + " to "+directory+"\n" );
else
System.out.println( "<ERROR>: Could not move "+list.get(j)+" to "+directory );
// If we made it this far, everything worked.
dtde.dropComplete( true );
// rebuild jtree
//if source folder still exists
// expand tree at source folder
// else expand tree at parent folder
// refresh table to match jtree
//refreshTree();
return;
// Hmm, the user must not have dropped a file list.
System.out.println( "Drop failed: " + dtde );
dtde.rejectDrop();
catch( Exception e )
e.printStackTrace();
dtde.rejectDrop();
return dtl;
// MISC FUNCTIONS //
public String getDirectory()
TreePath tp = getSelectionPath();
if( tp != null )
DefaultMutableTreeNode dmtn = ( DefaultMutableTreeNode ) tp.getLastPathComponent();
DiskObject dObj = ( DiskObject ) dmtn.getUserObject();
return dObj.getPath();
return null;
public void refreshTree()
System.out.println( "Refreshing Tree" );
dtModel.reload( root );
//dtModel.nodeChanged( root );
//dtModel.nodeStructureChanged( root() );
//setModel(dtModel);
//new AutoscrollTree(dtModel); -
Add node to a specific node in JTree
I use the following TreePanel class to add node to the tree. My question is how to add a new node under
a specific node which has been created before. In other words, how to get the path and identify the node.
For e.g., I first loaded some raw data files and created the "raw data" node, later I need to load another file
and create a new node under the "raw data" node. Each node is created by using user object. Any help is greatly appreicated.
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public class TreePanel extends JPanel {
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
protected JTree tree;
public TreePanel() {
super(new GridLayout(1,0));
rootNode = new DefaultMutableTreeNode("Experiment");
treeModel = new DefaultTreeModel(rootNode);
tree = new JTree(treeModel);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
JScrollPane scrollPane = new JScrollPane(tree);
add(scrollPane);
public JTree getTree(){
return tree;
/* Add child to the currently selected node. */
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);
/* Add child */
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent, Object child){
return addObject(parent, child, false);
/* Add child */
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;
/* Add child */
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent, DefaultMutableTreeNode child){
if(parent == null){parent = rootNode;}
treeModel.insertNodeInto(child, parent, parent.getChildCount());
return child;
}Thanks in advance!public static DefaultMutableTreeNode findNode(DefaultMutableTreeNode from, Object userObject) {
if (userObject == null && from.getUserObject() == null) {
return from;
} else if (userObject.equals(from.getUserObject())) {
return from;
DefaultMutableTreeNode node = null;
for (int i = 0; i < from.getChildCount(); i ++) {
node = (DefaultMutableTreeNode) from.getChildAt(i);
if (userObject == null) {
if (userObject == node.getUserObject()) {
break;
} else {
if (userObject.equals(node.getUserObject())) {
break;
node = null;
if (node != null) {
return node;
//Node not found
//dig deeper
for (int i = 0; i < from.getChildCount(); i ++) {
node = (DefaultMutableTreeNode) from.getChildAt(i);
if (!node.isLeaf()) {
node = findNode(node, userObject);
if (node != null) {
return node;
//Not found
return null;
} -
Icon was changed to default icon when editting a node on JTree
I have a tree with icon on nodes. However, when I edit the node, the icon is changed to default icon.
I don't known how to write the treeCellEditor to fix that one.
The following is my code:
package description.ui;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.ToolTipManager;
import javax.swing.WindowConstants;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
public class Tree extends javax.swing.JPanel {
private JTree tree;
private JScrollPane jScrollPane1;
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.getContentPane().add(new Tree());
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frame.pack();
frame.show();
public Tree() {
super();
initGUI();
private void initGUI() {
try {
BorderLayout thisLayout = new BorderLayout();
this.setLayout(thisLayout);
setPreferredSize(new Dimension(400, 300));
jScrollPane1 = new JScrollPane();
this.add(jScrollPane1, BorderLayout.CENTER);
DefaultMutableTreeNode rootNode = createNode();
tree = new JTree(rootNode);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
jScrollPane1.setViewportView(tree);
ToolTipManager.sharedInstance().registerComponent(tree);
MyCellRenderer cellRenderer = new MyCellRenderer();
tree.setCellRenderer(cellRenderer);
tree.setEditable(true);
tree.setCellEditor(new DefaultTreeCellEditor(tree, cellRenderer));
//tree.setCellEditor(new MyCellEditor(tree, cellRenderer));
} catch (Exception e) {
e.printStackTrace();
private void btRemoveActionPerformed(ActionEvent evt) {
TreePath path = tree.getSelectionPath();
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)path.getLastPathComponent();
((DefaultTreeModel)tree.getModel()).removeNodeFromParent(selectedNode);
private DefaultMutableTreeNode createNode() {
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Doc");
DefaultMutableTreeNode ch1 = createChuongNode(rootNode, "Ch1");
DefaultMutableTreeNode ch2 = createChuongNode(rootNode, "Ch2");
createTextLeafNode(ch1, "title");
return rootNode;
private DefaultMutableTreeNode createChuongNode(DefaultMutableTreeNode parent, String name) {
DefaultMutableTreeNode node = new DefaultMutableTreeNode(new ChapterNodeData(name));
parent.add(node);
return node;
private DefaultMutableTreeNode createTextLeafNode(DefaultMutableTreeNode parent, String name) {
DefaultMutableTreeNode node = new DefaultMutableTreeNode(new TitleNodeData(name));
parent.add(node);
return node;
private class MyCellRenderer extends DefaultTreeCellRenderer {
ImageIcon titleIcon;
ImageIcon chapterIcon;
public MyCellRenderer() {
titleIcon = new ImageIcon(getClass().getClassLoader()
.getResource("description/ui/icons/Text16.gif"));
chapterIcon = new ImageIcon(getClass().getClassLoader()
.getResource("description/ui/icons/Element16.gif"));
public Component getTreeCellRendererComponent(
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) {
super.getTreeCellRendererComponent(
tree, value, sel,
expanded, leaf, row,
hasFocus);
if (isChapterNode(value)) {
setIcon(chapterIcon);
setToolTipText("chapter");
} else if (isTextLeafNode(value)) {
setIcon(titleIcon);
setToolTipText("title");
return this;
protected boolean isChapterNode(Object node) {
return ((DefaultMutableTreeNode)node).getUserObject() instanceof ChapterNodeData;
protected boolean isTextLeafNode(Object node) {
return ((DefaultMutableTreeNode)node).getUserObject() instanceof TitleNodeData;
private class MyCellEditor extends DefaultTreeCellEditor {
ImageIcon titleIcon;
ImageIcon chapterIcon;
public MyCellEditor(JTree tree, DefaultTreeCellRenderer renderer) {
super(tree, renderer);
titleIcon = new ImageIcon(getClass().getClassLoader()
.getResource("description/ui/icons/Text16.gif"));
titleIcon = new ImageIcon(getClass().getClassLoader()
.getResource("description/ui/icons/Element16.gif"));
public Component getTreeCellEditorComponent(
JTree tree,
Object value,
boolean isSelected,
boolean expanded,
boolean leaf,
int row) {
super.getTreeCellEditorComponent(tree, value, isSelected, expanded, leaf, row);
return this.editingComponent;
abstract class NodeData{
String name;
public NodeData(String name) {
this.name = name;
public String getName() {
return name;
public void setName(String name) {
this.name = name;
public String toString() {
return name;
class ChapterNodeData extends NodeData {
public ChapterNodeData(String s) {
super(s);
class TitleNodeData extends NodeData {
public TitleNodeData(String attr) {
super(attr);
}Arungeeth wrote:
I know the name of the node... but i cant able to find that nodeHere is some sample code for searching and selecting a node:
TreeModel model = jtemp.getModel();
if (model != null) {
Object root = model.getRoot();
search(model, root, "Peter");//search for the name 'Peter'
System.out.println(jtemp.getSelectionPath().getLastPathComponent());
} else {
System.out.println("Tree is empty.");
private void search(TreeModel model, Object o, String argSearch) {
int cc;
cc = model.getChildCount(o);
for (int i = 0; i < cc; i++) {
DefaultMutableTreeNode child = (DefaultMutableTreeNode) model.getChild(o, i);
if (model.isLeaf(child)) {
TreeNode[] ar = child.getPath();
String currentValue = Arrays.toString(ar);
if (currentValue.contains(argSearch)) {
jtemp.setSelectionPath(new TreePath(ar));
} else {
search(model, child, argSearch);
} -
JTree Selection Behavior with Custom TreeCellEditor
I've recently had the need to build a custom TreeCellEditor with a JTree that allows single path selection. I've toyed around with it but don't understand it. When a node is clicked, the editor takes over rendering/handling the cell, and a TreeSelectionEvent is fired from the tree, but the isSelected boolean value passed to the TreeCellEditor is initially false. Then on a second click of the same path in the tree, no TreeSelectionEvent is fired, but the isSelected boolean value is true. It's as if the tree selection is occuring after the editor renders the cell. I would like the cell to appear selected on the first click. Can anyone shed some light on why this is happening and how I can fix it?
I included some code to demonstrate the problem below (though no actual editing takes place; the test code is only to demonstrate how the cells only appear selected with a yellow background after the second click of the same cell; note also that the valueChanged only executes on the first click). This test was run on Windows with Java 1.5.
public class TestTreeCellEditor extends JLabel implements TreeCellEditor {
private String st;
public TestTreeCellEditor() {
setOpaque(true);
public Component getTreeCellEditorComponent(JTree tree, Object value,
boolean isSelected, boolean expanded, boolean leaf, int row) {
this.st = value.toString();
setBackground(isSelected? Color.YELLOW : Color.WHITE);
setText(st);
return this;
public void addCellEditorListener(CellEditorListener l) {
// not important for test
public void cancelCellEditing() {
this.st = null;
public Object getCellEditorValue() {
return st;
public boolean isCellEditable(EventObject anEvent) {
return true;
public void removeCellEditorListener(CellEditorListener l) {
// not important for test
public boolean shouldSelectCell(EventObject anEvent) {
return true;
public boolean stopCellEditing() {
return true;
public class TestTreeCellEditorFrame extends JFrame implements TreeSelectionListener {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
launchGUI();
private static void launchGUI() {
TestTreeCellEditorFrame frame = new TestTreeCellEditorFrame();
JPanel treePanel = new JPanel();
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Root node");
DefaultMutableTreeNode childNode = new DefaultMutableTreeNode("Child 1");
rootNode.add(childNode);
childNode = new DefaultMutableTreeNode("Child 2");
rootNode.add(childNode);
JTree testTree = new JTree(rootNode);
testTree.addTreeSelectionListener(frame);
testTree.setCellEditor(new TestTreeCellEditor());
testTree.setEditable(true);
testTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
treePanel.add(testTree);
frame.setContentPane(treePanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600,400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
public void valueChanged(TreeSelectionEvent event) {
TreePath path = event.getNewLeadSelectionPath();
if (path != null) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();
System.out.println("TreeSelectionEvent on " + node.getUserObject().toString());
}Since my last post, I decided that I do want to be able to edit a cell that is not selected. In particular, when using a tree with checkboxes. What I'm doing for the time being, which works well enough, is to highlight the cell based on the isSelected value in combination with calling tree.stopEditing() in a TreeSelectionListener valueChanged method. This is somewhat of a hack solution, and has the side effect of a cell not appearing selected until the mouseReleased event. I'm still looking for a better solution, but for now it works well enough.
-
Custom Jtree Cell Renderer goes to infinite loopp...any suggestion???
Hey ...thanks for you help before....
Another problem..
My Jtree works fine with default Cell Renderer .. but goes to infinite
loop with CustomDefaultRenderer after few minutes...
Any suggestions....
public DynamicTree() {
super(new GridLayout(1,0));
rootNode = new DefaultMutableTreeNode("POSTINGS & SEARCHES");
treeModel = new DefaultTreeModel(rootNode);
treeModel.addTreeModelListener(new MyTreeModelListener());
tree = new JTree(treeModel);
tree.setEditable(false);
tree.getSelectionModel().setSelectionMode
(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
// tree.addMouseListener(ml);
// tree.addKeyListener(kl);
JScrollPane scrollPane = new JScrollPane(tree);
add(scrollPane);
// tree.setCellRenderer();
tree.addTreeSelectionListener(new TreeSelectionListener(){
public void valueChanged(TreeSelectionEvent evt){
System.out.println("Tree's lead selection path is " +
tree.getLeadSelectionPath());
tree.setCellRenderer( new CustomDefaultRenderer());
public class CustomDefaultRenderer extends DefaultTreeCellRenderer {
String suffix = null ;
String prefix = null ;
boolean expired = false;
boolean matched = false ;
PostingHandler pHandler = new PostingHandler();
public Component getTreeCellRendererComponent(
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) {
super.getTreeCellRendererComponent(
tree, value, sel,
expanded, leaf, row,
hasFocus);
suffix = (String)value.toString() ;
try {
prefix = value.toString().substring(0,value.toString().indexOf(":") + 1);
suffix = suffix.substring(suffix.indexOf(":")+1,suffix.length());
System.out.println("Prefix:"+prefix +"\tSufix :"+suffix);
}catch (Exception e){System.out.println("Nothing to index yet" + e);}
// value = (Object)suffix;
if(pHandler.newPostingsMatch.contains(prefix)) {
// if(hasFocus){pHandler.removePostingMatch(prefix);}
setBackgroundNonSelectionColor(Color.CYAN);
}else
setBackgroundNonSelectionColor(Color.WHITE);
System.out.println("Other <>values:\tValue" + value.toString() + "\tSEL:"+sel +"\tExpanded:" + "\tLEAF:"+leaf +
"\tRow:" +row + "\tfocus:"+hasFocus );
return this;
public void paintComponent(Graphics g){
System.out.println("Paint is called");
//g.drawLine(0, 0, 100, 100);
if(expired){
g.drawLine(22, 11, 100,11);
g.drawString(suffix, 22,15);
validate();
repaint();
}Figured it out right after this post :)
I had to do the following in my cellrenderer
setBackgroundNonSelectionColor(new Color(0, 0, 0, 0));As a parameter I sent a color object with a alpha level of 0 (completly transparent)... -
How to allow multiple selection of nodes in a JTree
How to allow multiple selection of nodes in a JTree ?
Thanks
S.SatishBy default when you create new instance og JTree the selection model is multiple selection. And if you want to change it you use next:
tee.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
or
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.CONTIGUOUS_TREE_SELECTION);
or
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
Hope will help! -
A bug in the JTree(Missing some nodes)
I have an application which implement a JTree & DnDTree. The left hand side is the original JTee, the right hand size is DnDTree which allows user to Drag and Drop some node from left JTree. The bug is: when I grag some node to right DnDTree, once I then click the left JTree, some nodes will be missing. I try my best for more than one week, but still couldn't fix it, could anybody take time to fina a way to fix it? The piece of code of creating JTree is as follow:
/*public void createTestTree()
DefaultMutableTreeNode rootRight = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode root = createTreeModel();
treeLeft = new DnDTree(root, true); //JTree(root, true);
treeLeft.putClientProperty("JTree.lineStyle", "Angled");
treeLeft.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
treeLeft.addTreeExpansionListener(new TreeExpansionListener(){
public void treeCollapsed(TreeExpansionEvent e) {
public void treeExpanded(TreeExpansionEvent e) {
UpdateStatus updateThread;
TreePath path = e.getPath();
FileNode node = (FileNode)
path.getLastPathComponent();
if( ! node.isExplored()) {
DefaultTreeModel model = (DefaultTreeModel)treeLeft.getModel();
UpdateStatus us = new UpdateStatus();
us.start();
node.explore();
model.nodeStructureChanged(node);
class UpdateStatus extends Thread {
public void run() {
try { Thread.currentThread().sleep(450); }
catch(InterruptedException e) { }
SwingUtilities.invokeLater(new Runnable() {
public void run() {
treeRight = new DnDTree(rootRight, true); treeRight.putClientProperty("JTree.lineStyle", "Angled");
treeRight.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
treeRight.addTreeExpansionListener(new TreeExpansionListener(){
public void treeCollapsed(TreeExpansionEvent e) {
public void treeExpanded(TreeExpansionEvent e) {
UpdateStatus updateThread;
TreePath path = e.getPath();
FileNode node = (FileNode)
path.getLastPathComponent();
if( ! node.isExplored()) {
DefaultTreeModel model = (DefaultTreeModel)treeRight.getModel();
UpdateStatus us = new UpdateStatus();
us.start();
node.explore();
model.nodeStructureChanged(node);
class UpdateStatus extends Thread {
public void run() {
try { Thread.currentThread().sleep(450); }
catch(InterruptedException e) { }
SwingUtilities.invokeLater(new Runnable() {
public void run() {
My FileNode class is:
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.util.EventObject;
public class GoodFileTree extends JPanel {
public GoodFileTree() {
final JTree tree = new JTree(createTreeModel());
JScrollPane scrollPane = new JScrollPane(tree);
this.add(scrollPane, BorderLayout.WEST);
//getContentPane().add(scrollPane, BorderLayout.CENTER);
this.add(GJApp.getStatusArea(),BorderLayout.SOUTH);
//getContentPane().add(GJApp.getStatusArea(),BorderLayout.SOUTH);
tree.addTreeExpansionListener(new TreeExpansionListener(){
public void treeCollapsed(TreeExpansionEvent e) {
public void treeExpanded(TreeExpansionEvent e) {
UpdateStatus updateThread;
TreePath path = e.getPath();
FileNode node = (FileNode)
path.getLastPathComponent();
if( ! node.isExplored()) {
DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
GJApp.updateStatus("exploring ...");
UpdateStatus us = new UpdateStatus();
us.start();
node.explore();
model.nodeStructureChanged(node);
class UpdateStatus extends Thread {
public void run() {
try { Thread.currentThread().sleep(450); }
catch(InterruptedException e) { }
SwingUtilities.invokeLater(new Runnable() {
public void run() {
GJApp.updateStatus(" ");
private DefaultMutableTreeNode createTreeModel() {
/*File root = new File("E:/");
FileNode rootNode = new FileNode(root);
rootNode.explore();
return new DefaultTreeModel(rootNode);*/
DefaultMutableTreeNode top = new DefaultMutableTreeNode("Root");
File[] fArr = File.listRoots();
File fDrive;
FileNode driveNode;
for(int i=0; i<fArr.length; ++i)
fDrive = fArr;
driveNode = new FileNode(fDrive);
top.add(driveNode);
return top;
/*public static void main(String args[])
try
UIManager.setLookAndFeel(
UIManager.getSystemLookAndFeelClassName()
//UIManager.getCrossPlatformLookAndFeelClassName()
catch (Exception e)
GJApp.launch(new GoodFileTree(),"JTree File Explorer",
300,300,450,400);
class FileNode extends DefaultMutableTreeNode {
private boolean explored = false;
public FileNode(File file) {
setUserObject(file);
public boolean getAllowsChildren() { return isDirectory(); }
public boolean isLeaf() { return !isDirectory(); }
public File getFile() { return (File)getUserObject(); }
public boolean isExplored() { return explored; }
public boolean isDirectory() {
File file = getFile();
return file.isDirectory();
public String toString() {
File file = (File)getUserObject();
String filename = file.toString();
int index = filename.lastIndexOf(File.separator);
return (index != -1 && index != filename.length()-1) ?
filename.substring(index+1) :
filename;
public void explore() {
if(!isDirectory())
return;
if(!isExplored()) {
File file = getFile();
File[] children = file.listFiles();
for(int i=0; i < children.length; ++i)
add(new FileNode(children[i]));
explored = true;
class GJApp extends WindowAdapter {
static private JPanel statusArea = new JPanel();
static private JLabel status = new JLabel(" ");
public static void launch(final JFrame f, String title,
final int x, final int y,
final int w, int h) {
f.setTitle(title);
f.setBounds(x,y,w,h);
f.setVisible(true);
statusArea.setBorder(BorderFactory.createEtchedBorder());
statusArea.setLayout(new FlowLayout(FlowLayout.LEFT,0,0));
statusArea.add(status);
status.setHorizontalAlignment(JLabel.LEFT);
f.setDefaultCloseOperation(
WindowConstants.DISPOSE_ON_CLOSE);
f.addWindowListener(new WindowAdapter() {
public void windowClosed(WindowEvent e) {
System.exit(0);
static public JPanel getStatusArea() {
return statusArea;
static public void updateStatus(String s) {
status.setText(s);
Thanks in advance.Hi Paul,
sorry for my late reply, but I usually don't work on weekends (this time it was an exception).
OK, then, to your problem:
- at the first look I thought you did NOT follow all the instruction (namely, the constructor of your trees has no info that you want to use model, or whatsoever), but later I realized that your approach: create the tree first and then assign a model to it (or in fact, get the model from the tree via: tree.getModel()) might work as well
- having no debugger I am not able to have much clue about your program / and it seems that you coding suffers from your being in a hurry:
- no comments - don't know which method is expected to do what
- misleading names (createTreeModel does nothing with the model, but creates some new nodes??)
therefore, I'm sorry, but I'm not able to detect exactly where the error is.
- anyway, having a quick glance on your code I have some suspections:
- you have 2 trees (treeLeft, treeRight), but just one model (model)
( it seems that you assign it dynamically when needed - either you take the model of the left or of the right tree)
- however, when this assignment takes place (in createTestTree()), you DO NOT ASSIGN IT to the class' protected attribute model, but to a local variable model (of the same type, however - since you introduce it as:
DefaultTreeModel model you override the model from class' attributes) - therefore, your assignment is no valid when the block in which ot is located is finished
- note, that you NEED the model when you add/delete nodes of the tree (somewhere in DnDTree? - then quite probably your local assignment of model is not valid any longer)
My suggestion, therefore, is:
somehow try to encapsulate the model to your tree (note that I only created the model outside the tree, because I needed it for running the constructor, but all other usages of the model are made WITHIN the class of the tree) - the best, do it the same way - through the constructor
then, in the place when you insert/remove nodes you will have no problem at all
I will e-mail you my whole "project" so that you may observe all parts - how it's written. I trust if you can't figure it out from my writings here (maybe I missed the point) you may get it from that example.
Hope it helps - GOOD LUCK -
How to Create XML Schema From JTree ?
Please help me... Thank you.
This is Code
Tree.java ----- Run This File
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.tree.DefaultMutableTreeNode;
public class Tree extends JPanel implements ActionListener {
private int newNodeSuffix = 1;
private static String ADD_COMMAND = "add";
private static String REMOVE_COMMAND = "remove";
private static String CLEAR_COMMAND = "clear";
private static String OK_COMMAND = "ok";
private DynamicTree treePanel;
public Tree() {
super(new BorderLayout());
//Create the components.
treePanel = new DynamicTree();
//populateTree(treePanel);
JButton addButton = new JButton("Add");
addButton.setActionCommand(ADD_COMMAND);
addButton.addActionListener(this);
JButton removeButton = new JButton("Remove");
removeButton.setActionCommand(REMOVE_COMMAND);
removeButton.addActionListener(this);
JButton clearButton = new JButton("Clear");
clearButton.setActionCommand(CLEAR_COMMAND);
clearButton.addActionListener(this);
JButton okButton = new JButton("OK");
okButton.setActionCommand(OK_COMMAND);
okButton.addActionListener(this);
//Lay everything out.
treePanel.setPreferredSize(new Dimension(300, 150));
add(treePanel, BorderLayout.CENTER);
JPanel panel = new JPanel(new GridLayout(0,1));
panel.add(addButton);
panel.add(removeButton);
panel.add(clearButton);
panel.add(okButton);
add(panel, BorderLayout.LINE_END);
/*public void populateTree(DynamicTree treePanel) {
String p1Name = new String("Parent 1");
//String p2Name = new String("Parent 2");
String c1Name = new String("Child 1");
//String c2Name = new String("Child 2");
DefaultMutableTreeNode p1;
p1 = treePanel.addObject(null, p1Name);
//p2 = treePanel.addObject(null, p2Name);
treePanel.addObject(p1, c1Name);
//treePanel.addObject(p1, c2Name);
//treePanel.addObject(p2, c1Name);
//treePanel.addObject(p2, c2Name);
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (ADD_COMMAND.equals(command)) {
//Add button clicked.
treePanel.addObject("New Node " + newNodeSuffix++);
} else if (REMOVE_COMMAND.equals(command)) {
//Remove button clicked.
treePanel.removeCurrentNode();
} else if (CLEAR_COMMAND.equals(command)) {
//Clear button clicked.
treePanel.clear();
} else if (OK_COMMAND.equals(command)) {
//Ok button clicked.
treePanel.ok();
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("Craete XML Tree");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
Tree newContentPane = new Tree();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}DynamicTree.java
import javax.swing.JOptionPane;
import java.awt.GridLayout;
import java.awt.Toolkit;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
public class DynamicTree extends JPanel {
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
protected JTree tree;
private Toolkit toolkit = Toolkit.getDefaultToolkit();
public DynamicTree() {
super(new GridLayout(1,0));
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);
JScrollPane scrollPane = new JScrollPane(tree);
add(scrollPane);
/** Remove all nodes except the root node. */
public void clear() {
rootNode.removeAllChildren();
treeModel.reload();
public void ok() {
int n = JOptionPane.showConfirmDialog(null, "Do you want to create XML Schema?", "", JOptionPane.YES_NO_OPTION);
/** Remove the currently selected node. */
public void removeCurrentNode() {
TreePath currentSelection = tree.getSelectionPath();
if (currentSelection != null) {
DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode)
(currentSelection.getLastPathComponent());
MutableTreeNode parent = (MutableTreeNode)(currentNode.getParent());
if (parent != null) {
treeModel.removeNodeFromParent(currentNode);
return;
// Either there was no selection, or the root was selected.
toolkit.beep();
/** Add child to the currently selected node. */
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());
//Make sure the user can see the lovely new node.
if (shouldBeVisible) {
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
class MyTreeModelListener implements TreeModelListener {
public void treeNodesChanged(TreeModelEvent e) {
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
(e.getTreePath().getLastPathComponent());
* If the event lists children, then the changed
* node is the child of the node we've already
* gotten. Otherwise, the changed node and the
* specified node are the same.
try {
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
(node.getChildAt(index));
} catch (NullPointerException exc) {}
System.out.println("The user has finished editing the node.");
System.out.println("New value: " + node.getUserObject());
public void treeNodesInserted(TreeModelEvent e) {
public void treeNodesRemoved(TreeModelEvent e) {
public void treeStructureChanged(TreeModelEvent e) {
}XML shema is basically an XML file. So u need to know how to create an XML,
provided u know how the shema file should be.
Creating an XML :
http://forum.java.sun.com/thread.jspa?threadID=5181031&messageID=9705786#9705786 -
Enter key not expanding JTree branches in 1.4?
Hi,
I have noticed that when pressing enter when a node is selected in a Jtree does not perform an expand/collapse on a branch or a programatic "double click" if it is a leaf. This seems to only apply to JDK 1.4. In 1.3 it does have this behaviour.
Does this sound right?
If for whatever reason this feature was removed, what is the workaround? I tried using a KeyListener and that did not seem to work.I have found a workaround. The following will allow the tree to expand/collapse branches on pressing "Enter".
tree.getInputMap().put(KeyStroke.getKeyStroke("ENTER"), "toggle");where "tree" is an instance of JTree. (BTW, I disconvered this by making a comparison between the WindowsLookAndFeel class in 1.3 and 1.4.)
However, I still cannot get it to do the programmatic equivelant of double clicking on a leaf. I am able to get a keylistener to listen for when [Enter] is pressed but I don't know where to go from there.
Here is my code so far.
* Created on Sep 9, 2003
package Andar;
import java.awt.event.*;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.KeyStroke;
import javax.swing.event.*;
import javax.swing.tree.*;
* @author avromf
public class TreeDemo extends JTree
private DefaultMutableTreeNode currentNode;
public static void main(String[] args)
JFrame frame= new JFrame("Test");
TreeDemo tree= new TreeDemo();
frame.getContentPane().add(tree);
frame.setSize(300,200);
frame.setVisible(true);
public TreeDemo()
super();
getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
addTreeSelectionListener(new TreeSelectionListener()
public void valueChanged(TreeSelectionEvent e)
currentNode = (DefaultMutableTreeNode) getLastSelectedPathComponent();
getInputMap().put(KeyStroke.getKeyStroke("ENTER"), "toggle");
addKeyListener(new KeyAdapter()
public void keyTyped(KeyEvent e)
if (currentNode != null && currentNode.isLeaf() && e.getKeyChar() == '\n')
System.out.println(currentNode);
}Any suggestions? -
Preventing user from selecting item in JTree
Does anyone know how to prevent the user from being able to change the cell in the tree that is currently selected?
I have a JTree that the user can select items from but I want them to be able to click on a button and no longer be able to select an item in the tree until another button is pressed.
Any ideas?hi
i hope the code below helps ur purpose
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public class Frame1 extends JFrame {
JPanel contentPane;
BorderLayout borderLayout1 = new BorderLayout();
JPanel jPanel1 = new JPanel();
JButton jButton1 = new JButton();
JButton jButton2 = new JButton();
MyTree jTree1 = new MyTree();
boolean blnSelection = true;
/**Construct the frame*/
public Frame1() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
/**Component initialization*/
private void jbInit() throws Exception {
//setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));
contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(borderLayout1);
this.setSize(new Dimension(466, 319));
this.setTitle("Frame Title");
jButton1.setText("jButton1");
jButton1.setBounds(new Rectangle(83, 254, 79, 27));
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton1_actionPerformed(e);
jPanel1.setLayout(null);
jButton2.setText("jButton2");
jButton2.setBounds(new Rectangle(177, 256, 89, 23));
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton2_actionPerformed(e);
jTree1.setBounds(new Rectangle(93, 30, 252, 195));
contentPane.add(jPanel1, BorderLayout.CENTER);
jPanel1.add(jButton1, null);
jPanel1.add(jButton2, null);
jPanel1.add(jTree1, null);
/**Overridden so we can exit when window is closed*/
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
void jButton1_actionPerformed(ActionEvent e) {
blnSelection = false;
jTree1.setSelectionPath(null);
void jButton2_actionPerformed(ActionEvent e) {
blnSelection = true;
class MyTree extends JTree implements TreeSelectionListener
public MyTree()
super();
init();
private void init()
this.getSelectionModel().setSelectionModeTreeSelectionModel.SINGLE_TREE_SELECTION);
this.addTreeSelectionListener(this);
this.setEditable(false);
DefaultMutableTreeNode selectedNode = null;
public void valueChanged(TreeSelectionEvent evt)
if(!blnSelection)
this.setSelectionPath(null);
else
TreePath tpSelectedTreePath = evt.getNewLeadSelectionPath();
this.setSelectionPath(tpSelectedTreePath);
cheers
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