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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.
Consider Paul's rocket mass heater.
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