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Node labelling within a tree using depth-first traversal

Adriana Woolley
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I'm currently trying to work my way through Java and need some advice on using and traversing trees. I've written a basic JTree program, which allows the user to add and delete nodes. Each new node is labelled in a sequential order and not dependent upon where they are added to the tree.

Basically, what is the best way to add and delete these new nodes with labels that reflect their position in the tree in a depth-first traversal?

ie: the new node's label will correctly reflect its position in the tree and the other labels will change to reflect this addition of a new node.

I've searched Google and can't seem to find any appropriate examples for this case.

My current code is as follows,

Thank you for any help.
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