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JTree

 
Greenhorn
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Hello,

I have been making a dynamic JTree but when i delet a node it disapears from the tree but when i click to expand the new tree the node that has been removed reapers. Can anyone help me so that when i remove the node it does not come back when i try expand the tree.



I am using


 
Greenhorn
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Each time, before calling populateTree(), we should initialize again "rootNode" and "treeModel" and set the "treeModel" to the tree:
 
Alan Brooks
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This is being done already and does not help
 
Andre Uhres
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Alan Brooks wrote:This is being done already and does not help


Could you please post a short independant and compilable example?
 
Alan Brooks
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Hey managed to get the JTree to update I was not redrawing it the correct way. I have one last question. If you use a treeModel is there anyway to rename the node after it has been inserted.
 
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Alan Brooks wrote:Hey managed to get the JTree to update I was not redrawing it the correct way. I have one last question. If you use a treeModel is there anyway to rename the node after it has been inserted.



I noticed you are passing the name of the User object to the constructor of DefaultMutableTreeNode. This works, however, for renaming and IMO best practice dictates that you specify a custom User Object in the constructor of your node. The node will then use the toString method of your object for the node label.

subFolder = new DefaultMutableTreeNode(getUser(a));

And then assuming User's toString returns getName(), you're good. Anytime you want access to this object you can simple do:

User user = (User)node.getUserObject();

Then changing the name of 'user' will change the name of the nodes label.
 
Andre Uhres
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Gregg Bolinger wrote:Then changing the name of 'user' will change the name of the nodes label.


To refresh the GUI we also need to call nodeChanged:
defaultTreeModel.nodeChanged(node);
 
Alan Brooks
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I know this is still not IMO best practice but is doing this the values in the Jtree do not chnage, do you know were i am going wrong
 
It is sorta covered in the JavaRanch Style Guide.
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