How to calculate sum in jtable

Hi,i want to ask.Can you teach me how to calculate sum in jtable?For example i got rows of qty,price and total.The total is null unless the user enter value in qty,and when the user press enter key in the qty,the sum will be displayed in the total.Thanks a lot..

Calculate the sum on the fly when the tableModel is updated (setValueAt() ) or let your row Object deal with it.

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