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I am using DefaultMutableTreeNode. I set the object for the node using
setUserObject , but I need to concatenate strings to the node and display the concatenated value for the object.

Is there a way to do this , instead of having to override the toString method.
 
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Overriding the toString() method of the object you put into the tree node is certainly the most natural way to do that, and I can't really see why you would not want to do it. But if there is some reason why not, you could probably have your TreeCellRenderer set some different text.
 
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