change the jtree node text runtime

java swing jtree
adesh singh picture adesh singh · Apr 15, 2013 · Viewed 12.8k times · Source

I am trying to create a JTree in java swing now i want to change the node text at runtime

try
 {

int a=1,b=2,c=3;
 DefaultMutableTreeNode root =
new DefaultMutableTreeNode("A"+a);
DefaultMutableTreeNode child[]=new DefaultMutableTreeNode[1];
DefaultMutableTreeNode grandChild[]= new DefaultMutableTreeNode[1];

child[0] = new DefaultMutableTreeNode("Central Excise"+b);
  grandChild[0]=new DefaultMutableTreeNode("CE Acts: "+c);
child[0].add(grandChild[0]);
 root.add(child[0]);
tree = new JTree(root);
 }
 catch(Exception ex)

 {
  ex.printStackTrace()
 }

Now i want later on how can i change A 1 to a 2 dynamically and similarly in child and grand child nodes

Answer

Guillaume Polet picture Guillaume Polet · Apr 15, 2013

You are looking for javax.swing.tree.DefaultMutableTreeNode.setUserObject(Object)

DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
root.setUserObject("My label");
model.nodeChanged(root);

This assumes that you are using the DefautltTreeModel.

Related questions

How can I refresh a JTree after adding some nodes to the underlying model?

First of all, let me say that I dont use the DefaultTreeModel. I implement my own TreeModel, so i cant use the DefaultXXX stuff. The problem is this: Through some addStuff() methods which my model defines I add nodes to …

Read More
Adding and removing nodes from a JTree

I have a very basic JTree. As I am on a rush, I'd prefer not to use TreeModel if it is not needed. I wrote a SSCCE to expose the problem: Sometimes I add a node. Other times I remove …

Read More
How to get selected node from JTree after selecting it?

Possible Duplicate: JTree: how to get the text of selected item? 1In C# there's TreeView_afterSelect event, and i ask if in java is something like that ? I used : hierarchyPropertyChange but it runs two times...

Read More