Unable to refresh JTree

Question

Hi!
I am using a TreeModel to manage the content of a JTree.
I provide buttons to add/remove items in the tree. The content is correctly modified (when I do some System.out.println(...)), but I don't see the new items on my displayed tree.
I tried to use
JTree.revalidate();
JTree.repaint();
And the same on the panel containing the JTree, nothing works!
What should I do?
Thanks a lot
Choub

Answer 1

Hi,
you can try with this sample code:
* <p>Adds a new objects in the JTree. </p>
* @param parent - the DefaultMutableTreeNode parent
* @param child - the object to add
* @param shouldBeVisible - if it is true, all the path components in path
* are expanded and scrolls so that the
* node identified by the path is displayed.
* @return a DefaultMutableTreeNode object
* @see javax.swing.tree.DefaultMutableTreeNode
public DefaultMutableTreeNode addObject( DefaultMutableTreeNode parent,
Object child,
boolean shouldBeVisible) {
DefaultMutableTreeNode childNode = null;
switch ( this.levelSelected ) {
case 0: childNode = new DefaultMutableTreeNode(
new IconData( rm.getIcon("db/Computer.gif"), child ) );
break;
case 1: childNode = new DefaultMutableTreeNode(
new IconData( rm.getIcon("db/BCard.gif"), child ) );
break;
case 2: childNode = new DefaultMutableTreeNode(
new IconData( rm.getIcon("db/Thread.gif"), child ) );
break;
if ( null == childNode )
return null;
if ( null == parent ) {
parent = root;
model.insertNodeInto( childNode, parent, parent.getChildCount() );
model.reload();
if ( shouldBeVisible ) {
logicTree.scrollPathToVisible( new TreePath( childNode.getPath() ) );
return childNode;
Regards.