JTree: HOW TO add a new node

Question

Hi everybody,
Im going to try to be clear...
My problem is the following: I am a beginner using JTree and what I want to do is to add a new node in a certain position in my JTree. I would be very grateful if apart from explanation, any of you could provide me with a piece of code.
Let us think that my tree has the root and some first-level children called group 1, ..., group n. Every group has some children called rulemodule 1, ..., rulemodule m. And every rulemodule has some children called rule 1, ..., rule j.
An example of the visual look of my jtree:
root
__ group 1
____ rulemodule 1.1
______ rule 1.1.1
____ rulemodule 1.2
______ rule 1.2.1
______ rule 1.2.2
______ rule 1.2.3
__ group 2
____ rulemodule 2.1
______ rule 2.1.1
____ rulemodule 2.2
______ rule 2.2.1
Then, let us say that what I want is to add a new rule in the position where it is in this moment rule 1.2.2 (so the rule that was 1.2.2 before would be now 1.2.3, and the one that was 1.2.3 would be now 1.2.4). So I know the name of the group, the name of the rulemodule and the position of the new rule. How could I do that?
In order to build the JTree I have the following statements:
TreeNode treeNode = fillTheTree(ruleModulePart.config.getRuleModules()); This function actually builds the tree.
jTreeModel = new DefaultTreeModel(treeNode);
jTree = new JTree(jTreeModel);
Thanks a lot to everybody!
Fran.

Answer 1

Thanks a lot for your answer Maxideon,
Well, I think that I did not explained it the problem very well...
The example of the tree was just that, an example, but the tree does not look like that. I just wanted to show that the tree has 3 levels of depth.
The declaration of the function would actually be like that:
public void UpdateJTreeWithNewRule (String groupName, String ruleModuleName, String newRuleName, int positionOfNewRule) {
}So I think that I would need to do first a search to find the position of the "group" which corresponds to that 'groupName' and after that the position of the "rulemodule" which corresponds to that 'ruleModuleName'. And then add the 'newRuleName' in the position 'positionOfNewRule' inside that "rulemodule".
Thanks a lot again,
Fran.