JTree root node is demoted, but ...

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hiwa - 13 Jan 2005 10:40 GMT

I have made a JTree:

JTree tree = new JTree(orignalRootNode);

Then, I have demoted the root:

newRootNode.add(originalRootNode);

Now, real root node is newRootNode.

tree = new JTree(newRootNode);

But, aren't there more moderate ways for tree updating
than this brute-force?

It seems any method of tree model and tree node can't do
that.

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Thomas Fritsch - 13 Jan 2005 12:54 GMT

> I have made a JTree:
>
[quoted text clipped - 13 lines]
> It seems any method of tree model and tree node can't do
> that.

If you have a DefaultTreeModel (or a subclass of it), you can simply
call its method
public void setRoot(TreeNode root);
for example like this:
((DefaultTreeModel) tree.getModel()).setRoot(newRootNode);

If you don't have a DefaultTreeModel, you could override its method
public Object getRoot();
of interface TreeModel and implement a setRoot method of your own.

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