Unable to update nodes in JTree

Question

Hi all,
I have a JTree, which I have passed in a DefaultMutableTreeNode in the constructor. I have added 3 elements inside this "root". So the JTree looks like this :
Root
->Element 1
->Element 2
->Element 3
However, when I want to actually delete these 3 nodes and add in another 2 nodes, it doesn't work for me, a sample :
//JTree which is created, using DefaultMutableTreeNode
DefaultMutableTreeNode node = new DefaultMutableTreeNode("Root");
//add 3 nodes inside first
node.add(new DefaultMutableTreeNode("Element 1"));
node.add(new DefaultMutableTreeNode("Element 2"));
node.add(new DefaultMutableTreeNode("Element 3"));
JTree jtree = new JTree(node);
//get the root (which has 3 elements now)
DefaultMutableTreeNode rootNode = (DefaultMutableTreeNode)jtree.getModel().getRoot();
//delete the 3 elements
rootNode.removeAllChildren();
//then add in another 2 more nodes
rootNode.add(new DefaultMutableTreeNode("New Element 1"));
rootNode.add(new DefaultMutableTreeNode("New Element 2"));
The jtree created does display the first 3 elements, however when after adding in 2 more new elements, the tree doesnt change.
Any tips and comments will be greatly appreciated! Thanks.

Answer 1

Oops, yeah. My mistake was, The tree should have a model, instead of just nodes connecting to nodes... that's why it wasnt able to update... i've should used a model from the start. its the correct way isnt it :) i can continue my project now .. thanks all