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

Question

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()

Answer 1

I've always found the TreeModel a bit confusing. I agree with the above statement that the model should notify the view when a change is made so the view can repaint itself. However, this does not seem to be the case when using the DefaultTreeModel. I find you need to invoke the reload() method after updating the model. Something like:

DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode)model.getRoot();
root.add(new DefaultMutableTreeNode("another_child"));
model.reload(root);