JTree path

Question

I built a JTree thanks to several DefaultMutableTreeNode, wich were instantiate by:
new DefaultMutableTreeNode ( MyCategory );
MyCategory is an object from a class I made by my self (class CategoryNode)
The snag is, once I have this tree, I retrieve a given CategoryNode, and I must set the selection of my tree so that this CategoryNode is the one that will be selected.
I do not understand how to do it. I tried with the "setSelectionPath(TreePath path) " method, but I do not know how to built the TreePath. I do not understand how it works.
Someone can help me ? Someone as an example of this ?
Thank you very much !
Sylvain.

Answer 1

My english as bad as yours:-))
i'm russian
Just an example of finding suitable node.
import javax.swing.*;
import javax.swing.tree.*;
class Test extends JFrame
public Test()
super("Test");
DefaultMutableTreeNode root=new DefaultMutableTreeNode("ROOT");
DefaultMutableTreeNode n1=new DefaultMutableTreeNode("1");
DefaultMutableTreeNode n2=new DefaultMutableTreeNode("1_1");
n1.add(n2);
String category="founded";
n2=new DefaultMutableTreeNode("1_2");
n1.add(n2);
root.add(n1);
DefaultMutableTreeNode nnnn=new DefaultMutableTreeNode(category);
n2.add(nnnn);
n1=new DefaultMutableTreeNode("2");
root.add(n1);
JTree tree=new JTree(root);
DefaultMutableTreeNode node=findNode(root,category);
tree.setSelectionPath(new TreePath(node.getPath()));
JScrollPane scroll=new JScrollPane(tree);
getContentPane().add(scroll);
setSize(300,300);
setVisible(true);
public DefaultMutableTreeNode findNode(DefaultMutableTreeNode localRoot,Object category) {
DefaultMutableTreeNode resultNode=null;
if (localRoot.getUserObject().equals(category)) {
return localRoot;
int cnt=localRoot.getChildCount();
for (int i=0; i<cnt; i++) {
DefaultMutableTreeNode tempNode=findNode((DefaultMutableTreeNode)localRoot.getChildAt(i),category);
if (tempNode!=null) {
return tempNode;
return resultNode;
public static void main(String a[])
new Test();
best regards
Stas