Traversing a tree with breadthFirstEnumeration

Question

Hi all,
I'm trying to traverse a DefaultMutableNode tree using breadthFirstEnumeration. However, while traversing I need to remove some branches and continue with the Enumeration.
Do you know any way to preserve the Enumeration after removing a branch???
For example:
for(Enumeration en = trial.breadthFirstEnumeration(); en.hasMoreElements() ;) {
               DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode)en.nextElement();
               if((String)currentNode.getUserObject() == "2") {
                    ((DefaultMutableTreeNode)(currentNode)).removeAllChildren();
               System.out.println((String)currentNode.getUserObject());
This code traverses a tree with depth 3 and branching factor 3. In the meanwhile it removes node 2's children.
However the otuput is
0 1 2 3 4 5 6
instead of: 0 1 2 3 4 5 6 10 11 12
I'd be very grateful if someone can help me.
Regards,
Pesho

Answer 1

This is how it usually is done.
Start with an empty map, e.g. HashMap. The map has e.g. company name as key, and company as value.
Start traversing, and do a lookup towards the map when you find a company reference. Use the company within the map if there is one, and create a new company and place it in the map if it doesn't exist. Populate the companies within the map with information when you bump into them during traversal.
The map will contain fully populated companies when the traversal is completed, and all companies will reference the same instances since you always are checking the map.
Kaj