JTree, updating model and DefaultMutableTreeNode - Java

Florent Georges wrote:
> Hi
>
> I am discovering the Swing's tree API. I am building a
> tree one node after the other (the nodes reflect different
> steps of a long-running process).
>
> The problem is that the nodes added after the construction
> of the tree are not shown. I guess I have to tell the tree
> in some way that the tree model has changed, but I don't
> know how.
>
> Below is a full simple sample that reproduce the same
> issue I have, I think:
>
> import javax.swing.JFrame;
> import javax.swing.JTree;
> import javax.swing.WindowConstants;
> import javax.swing.tree.DefaultMutableTreeNode;
> import javax.swing.tree.DefaultTreeModel;
>
> public class TreeAddNodes
> {
> public static void main(String[] args)
> {
> // first part of the model
> DefaultMutableTreeNode root =
> new DefaultMutableTreeNode("node 1");
> root.add(new DefaultMutableTreeNode("node 2"));
> root.add(new DefaultMutableTreeNode("node 3"));
>
> // the model and the tree
> JTree tree = new JTree(new DefaultTreeModel(root));
>
> // second part of the model, NOT SHOWN!
> root.add(new DefaultMutableTreeNode("node 4"));
> root.add(new DefaultMutableTreeNode("node 5"));

Maybe
tree.getModel().fireTreeNodesInserted(...);


>
> // GUI boilerplate
> JFrame frame = new JFrame();
> frame.setDefaultCloseOperation(
> WindowConstants.EXIT_ON_CLOSE);
> frame.setSize(200, 200);
> frame.add(tree);
> frame.show();
> }
> }
>
> Any comment greatly appraciated!

http://java.sun.com/products/jfc/tsc/articles/jtree/