Updating a JTree without application restart
I would like to update the JTree in my application without restarting the application. The JTree elements come from a file, therefore, I update the file and want the JTree to be refreshed! I understand that this is done with swing and model and already do so eg: I update combo boxes and these automatically reflect the changes. I use the code below to update the boxes:-
public void updateBoxes()
DefaultComboBoxModel newComboModel = new DefaultComboBoxModel(getItems());
myBox.setModel(newComboModel);
I would basically like to do exactly the same using another model for a JTree. Is this possible? Also, as the JTree has actually been added to a scroll panel, so does this affect things? Hopefully I can use a simple method like the one provided above for updaing a combo box.
Thanks for any assistance
* TestTree.java
package com.test;
import javax.swing.tree.DefaultMutableTreeNode;
public class TestTree extends javax.swing.JFrame {
private javax.swing.JScrollPane mainScrollPane;
private javax.swing.JButton btnChooseThree;
private javax.swing.JTree mainTree;
private javax.swing.JButton btnChooseOne;
private javax.swing.JPanel buttonPanel;
private javax.swing.JButton btnChooseTwo;
public TestTree() {
java.awt.GridBagConstraints gridBagConstraints;
mainScrollPane = new javax.swing.JScrollPane();
mainTree = new javax.swing.JTree();
buttonPanel = new javax.swing.JPanel();
btnChooseOne = new javax.swing.JButton();
btnChooseTwo = new javax.swing.JButton();
btnChooseThree = new javax.swing.JButton();
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
mainScrollPane.setViewportView(mainTree);
getContentPane().add(mainScrollPane, java.awt.BorderLayout.CENTER);
buttonPanel.setLayout(new java.awt.GridBagLayout());
btnChooseOne.setText("One");
btnChooseOne.setMaximumSize(new java.awt.Dimension(70, 27));
btnChooseOne.setMinimumSize(new java.awt.Dimension(70, 27));
btnChooseOne.setPreferredSize(new java.awt.Dimension(70, 27));
btnChooseOne.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnChooseOneActionPerformed(evt);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.insets = new java.awt.Insets(2, 2, 2, 2);
buttonPanel.add(btnChooseOne, gridBagConstraints);
btnChooseTwo.setText("Two");
btnChooseTwo.setMaximumSize(new java.awt.Dimension(70, 27));
btnChooseTwo.setMinimumSize(new java.awt.Dimension(70, 27));
btnChooseTwo.setPreferredSize(new java.awt.Dimension(70, 27));
btnChooseTwo.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnChooseTwoActionPerformed(evt);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.insets = new java.awt.Insets(2, 2, 2, 2);
buttonPanel.add(btnChooseTwo, gridBagConstraints);
btnChooseThree.setText("Three");
btnChooseThree.setMaximumSize(new java.awt.Dimension(70, 27));
btnChooseThree.setMinimumSize(new java.awt.Dimension(70, 27));
btnChooseThree.setPreferredSize(new java.awt.Dimension(70, 27));
btnChooseThree.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnChooseThreeActionPerformed(evt);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.insets = new java.awt.Insets(2, 2, 2, 2);
buttonPanel.add(btnChooseThree, gridBagConstraints);
getContentPane().add(buttonPanel, java.awt.BorderLayout.NORTH);
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Three");
rootNode.add(new DefaultMutableTreeNode("One"));
rootNode.add(new DefaultMutableTreeNode("Two"));
rootNode.add(new DefaultMutableTreeNode("Three"));
mainTree.setModel(new javax.swing.tree.DefaultTreeModel(rootNode));
pack();
private void btnChooseThreeActionPerformed(java.awt.event.ActionEvent evt) {
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Three");
rootNode.add(new DefaultMutableTreeNode("One"));
rootNode.add(new DefaultMutableTreeNode("Two"));
rootNode.add(new DefaultMutableTreeNode("Three"));
mainTree.setModel(new javax.swing.tree.DefaultTreeModel(rootNode));
private void btnChooseTwoActionPerformed(java.awt.event.ActionEvent evt) {
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Two");
DefaultMutableTreeNode subNode;
subNode = new DefaultMutableTreeNode("One");
subNode.add(new DefaultMutableTreeNode("Sub One"));
subNode.add(new DefaultMutableTreeNode("Sub Two"));
subNode.add(new DefaultMutableTreeNode("Sub Three"));
rootNode.add(subNode);
subNode = new DefaultMutableTreeNode("Two");
subNode.add(new DefaultMutableTreeNode("Sub One"));
subNode.add(new DefaultMutableTreeNode("Sub Two"));
subNode.add(new DefaultMutableTreeNode("Sub Three"));
rootNode.add(subNode);
subNode = new DefaultMutableTreeNode("Three");
subNode.add(new DefaultMutableTreeNode("Sub One"));
subNode.add(new DefaultMutableTreeNode("Sub Two"));
subNode.add(new DefaultMutableTreeNode("Sub Three"));
rootNode.add(subNode);
mainTree.setModel(new javax.swing.tree.DefaultTreeModel(rootNode));
private void btnChooseOneActionPerformed(java.awt.event.ActionEvent evt) {
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("One");
DefaultMutableTreeNode subNode;
DefaultMutableTreeNode subSubNode;
subNode = new DefaultMutableTreeNode("One");
subSubNode = new DefaultMutableTreeNode("Sub One");
subSubNode.add(new DefaultMutableTreeNode("Very Sub A"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub B"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub C"));
subNode.add(subSubNode);
subSubNode = new DefaultMutableTreeNode("Sub Two");
subSubNode.add(new DefaultMutableTreeNode("Very Sub 1"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub 2"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub 3"));
subNode.add(subSubNode);
subSubNode = new DefaultMutableTreeNode("Sub Three");
subSubNode.add(new DefaultMutableTreeNode("Very Sub X"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub Y"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub Z"));
subNode.add(subSubNode);
rootNode.add(subNode);
subNode = new DefaultMutableTreeNode("Two");
subSubNode = new DefaultMutableTreeNode("Sub One");
subSubNode.add(new DefaultMutableTreeNode("Very Sub A"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub B"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub C"));
subNode.add(subSubNode);
subSubNode = new DefaultMutableTreeNode("Sub Two");
subSubNode.add(new DefaultMutableTreeNode("Very Sub 1"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub 2"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub 3"));
subNode.add(subSubNode);
subSubNode = new DefaultMutableTreeNode("Sub Three");
subSubNode.add(new DefaultMutableTreeNode("Very Sub X"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub Y"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub Z"));
subNode.add(subSubNode);
rootNode.add(subNode);
subNode = new DefaultMutableTreeNode("Three");
subSubNode = new DefaultMutableTreeNode("Sub One");
subSubNode.add(new DefaultMutableTreeNode("Very Sub A"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub B"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub C"));
subNode.add(subSubNode);
subSubNode = new DefaultMutableTreeNode("Sub Two");
subSubNode.add(new DefaultMutableTreeNode("Very Sub 1"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub 2"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub 3"));
subNode.add(subSubNode);
subSubNode = new DefaultMutableTreeNode("Sub Three");
subSubNode.add(new DefaultMutableTreeNode("Very Sub X"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub Y"));
subSubNode.add(new DefaultMutableTreeNode("Very Sub Z"));
subNode.add(subSubNode);
rootNode.add(subNode);
mainTree.setModel(new javax.swing.tree.DefaultTreeModel(rootNode));
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
public static void main(String args[]) {
new TestTree().show();
}
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Please see my answers below.
Answer 1>
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public Policy( byte[] policy ) throws PolicyException, EncodingException;
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Menubar is not updating based on active application.
Hi,I am using iMac with 10.7.4 mac os.My problem is menubar is not updating based on active application.And finder menu bar is appearing when i open the finder.And on thta time if i select "About my mac" or "Force quit" then that didn't give any response.At same time when i open any application like firefox or anything that finder menu bar is apper but not responding.And another probelm is at the time of login i entering the password and submitting,it's opening the desktop and again total screen will be becpme white and showing the activityindicator.Sp please tell me what's the main problem.And how can i solve these problems.
Try restarting your iMac in safe mode (holding down the shift key while restarting) then see if you have the problem. If not then use disk utility to repair your permissions. Take a look at this link, http://support.apple.com/kb/HT1452
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Multiple Selection on JTree without holding down [CTRL] or [SHIFT]
I need an example about how make multiple selection on JTree without holding down [CTRL] or [SHIFT].
my JTree contains JCheckBox in any nodes, but I can't select two or more checkBox in time without holding down [CRTL] or [SHIFT].
thanks for help.
Jose A.I did this a few years ago so my newbiness is going to show through a bit, but I'm too lazy to update it.import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.util.*;
public class Test3 extends JFrame {
JTree jt = new JTree();
MultiTreeSelectionModel mtsm = new MultiTreeSelectionModel(jt);
JCheckBox multiCheck = new JCheckBox("Multi"),
branchCheck = new JCheckBox("Branch");
public Test3() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel content = (JPanel)getContentPane();
multiCheck.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
mtsm.setMultiSelect(multiCheck.isSelected());
branchCheck.setText("Branch");
branchCheck.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
mtsm.setBranchSelect(branchCheck.isSelected());
JPanel jp = new JPanel();
jp.add(multiCheck);
jp.add(branchCheck);
content.add(jp, BorderLayout.NORTH);
ActionListener specialKeyListener =
new ActionListener() {
public void actionPerformed(ActionEvent evt) {
MultiTreeSelectionModel.keyModifiers = evt.getModifiers();
KeyStroke keyStroke;
for (int i = 0; i < keys.length; i++) {
keyStroke = KeyStroke.getKeyStroke(keys[0], 0, true);
content.registerKeyboardAction(specialKeyListener, keyStroke,
JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
keyStroke = KeyStroke.getKeyStroke(keys[i][0], keys[i][1], false);
content.registerKeyboardAction(specialKeyListener, keyStroke,
JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
jt.setSelectionModel(mtsm);
content.add(new JScrollPane(jt), BorderLayout.CENTER);
setSize(300, 300);
setVisible(true);
public static void main(String[] args) { new Test3(); }
private static int[][] keys = {{KeyEvent.VK_CONTROL, ActionEvent.CTRL_MASK},
{KeyEvent.VK_SHIFT, ActionEvent.SHIFT_MASK},
{KeyEvent.VK_ALT, ActionEvent.ALT_MASK}};
class MultiTreeSelectionModel extends DefaultTreeSelectionModel {
static int keyModifiers;
private boolean branchSelect, multiSelect;
private JTree tree;
private TreePath[] savePaths;
MultiTreeSelectionModel(JTree Tree) {
tree = Tree;
setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
private boolean isSelected(TreePath Path) {
return tree.isPathSelected(Path) && (keyModifiers & KeyEvent.SHIFT_MASK) == 0;
private boolean branchSelect() {
return branchSelect || ((keyModifiers & KeyEvent.ALT_MASK) != 0);
public void addSelectionPaths(TreePath[] paths) {
if (branchSelect()) paths = getAllPaths(paths);
super.addSelectionPaths(paths);
public void removeSelectionPaths(TreePath[] paths) {
if (branchSelect()) paths = getAllPaths(paths);
super.removeSelectionPaths(paths);
public void setSelectionPaths(TreePath[] paths) {
if (branchSelect()) {
paths = getAllPaths(paths);
if (paths != null && paths.length > 0 && isSelected(paths[0])) {
super.removeSelectionPaths(paths);
} else if (multiSelect) super.addSelectionPaths(paths);
else super.setSelectionPaths(paths);
protected TreePath[] getAllPaths(TreePath[] paths) {
if (paths == null || paths.length == 0) {
return paths;
Vector vector = new Vector();
DefaultMutableTreeNode treeNode, thisNode;
for (int i = 0; i < paths.length; i++) {
if (paths[i] != null) {
thisNode = (DefaultMutableTreeNode) paths[i].getLastPathComponent();
Enumeration enumeration = thisNode.preorderEnumeration();
while (enumeration.hasMoreElements()) {
// add all descendants to vector
treeNode = (DefaultMutableTreeNode) enumeration.nextElement();
TreePath treePath = new TreePath(treeNode.getPath());
vector.add(treePath);
int i = vector.size();
TreePath[] allpaths = new TreePath[i];
for (int j = 0; j < i; j++) {
allpaths[j] = (TreePath) vector.elementAt(j);
return allpaths;
protected void setMultiSelect(boolean b) { multiSelect = b; }
protected boolean isMultiSelect() { return multiSelect; }
protected void setBranchSelect(boolean b) { branchSelect = b; }
protected boolean isBranchSelect() { return branchSelect; }
protected void savePaths(TreePath Path) {
TreePath[] tmpPaths = getSelectionPaths();
if (tmpPaths == null) {
savePaths = null;
} else {
int cnt = 0;
for (int i = 0; i < tmpPaths.length; i++) {
if (tmpPaths[i].isDescendant(Path)) {
cnt++;
savePaths = new TreePath[cnt];
cnt = 0;
for (int i = 0; i < tmpPaths.length; i++) {
if (tmpPaths[i].equals(Path) || tmpPaths[i].isDescendant(Path)) {
savePaths[cnt++] = tmpPaths[i];
protected void restorePaths() {
if (savePaths != null) {
final DefaultTreeSelectionModel foo = this;
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
foo.setSelectionPaths(savePaths); -
Hello everyone i have a wee bit of a problem here i have a JTree that gets updated by a text file. That bit works grand when the JTree is loaded it reads the text file and displays the contents now the bother i am having is the user has the option to add a new item to the text file but i cannot not seem to get it to update the JTree. I got to a point where it displayed the old and the new data in the tree is there a way to delete the old stuff
I think you need to rebuild the entire tree each time there is a change. This way, you are certain that all the items that are removed from the textfile are also removed from the tree.
Unless off course the text file is edited through the same application that displayes the tree, then you can come up with something smarter then that...
Mark -
I can't update or install new application on my iPad 2, please what can I do to solve this problem
I Can't update or install new application on my iPad 2 with retina displa running on iOS 8.1.2.
when I wanted to update, it was rolling for so many days and nothing happen. I don't know what to do.Hello, DGVLIMITED.
Thank you for visiting Apple Support Communities.
I would need clarification on what exact issue you are experiencing and any errors when attempting to update applications to provide a better answer. However, try updating applications individually. This could be a capacity limitation when updating all at once. Also, try restarting the device. If these steps do not resolve the issue, try the remaining steps in the article below.
Troubleshoot issues on an iPhone, iPad, or iPod touch
If you haven't been able to connect to the iTunes Store:
Make sure your date, time, and time zone are correct in Settings > General > Date & Time.
Note: Time Zone may list another city in your time zone.
Make sure that your iOS software is up to date by tapping Settings > General > Software Update(iOS 5 or later) or connecting your iOS device to iTunes and clickingCheck for Update on your device's Summary page.
Check and verify that you're in range of a Wi-Fi router or base station. If you're on a device with cellular service, make sure that cellular data is turned on from Settings > General > Cellular.
Note: If connected to cellular data, larger items may not download. You may need to connect to Wi-Fi to download apps, videos, and podcasts.
Make sure that you have an active Internet connection. You can check the user guide for your device for help with connecting to the Internet.
Make sure that other devices (portable computers, for example) are able to connect to the Wi-Fi network and access the Internet.
Try resetting (turning off and then on again) your Wi-Fi router.
If the issue persists, try troubleshooting your Wi-Fi networks and connections.
Can't connect to the iTunes Store
http://support.apple.com/en-us/HT201400
Cheers,
Jason H.
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