How remove childrens in SimpleTreeData?

subj

Hello Gorbunov,
I assume you've looked at the docs; SimpleTreeData is just that. A DataObject-subclass with a simple implementation for building tree structures. However, managing those tree structures is a separate issue. The various proxies provide means for displaying parts of the tree, if that would suffice for you.
I build a tree for use in an hGrid which contains approximately 150,000 elements. I find that the necessity of building a SimpleTreeData to be time-consuming and heavy on memory usage. Granted, once in memory, the hGrid functions fabulously.
Sorry I can't help, but I, too, am interested in the further developments of SimpleTreeData and/or related tree DataObjects. Are these DataObjects going to be updated to reflect the new Network Data Model components in Oracle 10g? Binding the data to a SQL "start with ... connect by" query would be great.
On the proxy side, the ability to display multiple paths through the tree would also be wonderful benefit.
Thanks for any input, UIX team.
joe

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I did a program where there are informations with a structure of dependence that should be showed inside JTree components.
I realized this purpose in my program .
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To explain well my problem, and facilitate the helpers, I post some code that show my problem..
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fillTrees(str1);
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but2.addActionListener(new ActionListener() {
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fillTrees(str2);
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JScrollPane jScrollPane[];
JTree jTree[];
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jScrollPane[i].setMinimumSize(treeMinDim);
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public void valueChanged(TreeSelectionEvent e) {
showContentOfTheTree(e);
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String stringaGotFromEvent = e.getPath().toString();
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hi Andre,
thank you for answering me.
I have not much practice with JTrees so I find some difficulty to use it...
After I got your advice, I made changed a little the design of my program..
This it is a program for management of a dentist office, and I would show in 8 JTrees (every jTree root represents the teeth in a dental arch) the treatments that each tooth got.
How I said, the 8 JTree roots are representing the teeth, and in this architecture the problem is:
- to add a node to a tree root to indicate a treatment for that tooth;
- to delete all the children from a jTree root before beginning to add new child, before writing again treatments, when the informations are changed.
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private void assingTreatmentToTooth(int toothNmbr, String strTreatment) {
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private void removeTreatmentFromAtooth(int toothNmbr, int childNmbr) {
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        model.removeNodeFromParent(child);
    } // removeTreatmentToTooth()when the second function is executed, I get this error:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.tree.DefaultTreeModel cannot be cast to javax.swing.tree.TreeNode
at the line : DefaultMutableTreeNode child = (DefaultMutableTreeNode) model.getChild(model, childNmbr);
DefaultMutableTreeNode child = (DefaultMutableTreeNode) model.getChild(model, childNmbr);
could you tell me what is wrong ?
regards
TonyMrsangelo

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