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I need help in JTree urgent  RSS feed

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Hello Everbody,
I have to give a name to a Root as a "Undefined" in JTree and i am using method jtree.setName("Undefined");
but its not working as when this JTree will open it would show its main root name like "undefined" .Could please tell me the exact method to give name to the Root in Jtree as this Jtree is getting data from Arraylist .
I need help.
Thanks alot
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