JTable get Old Value in the Listener of change Value

Software
JDK 1.5 Update 6
Requirements
I have a JTable I want to show the sum total of certain Cell Value.So I have added a TableModelListener by which on updating the cell Value I change the total in the JTextField. The Problem is If I change the value then I have to get the previous value that the cell had. How to get that original value before the update.
There is a way by which we can get the same by inserting one dummy column which stores previous value.But this method inserts unneccessary if you require the total of 3 columns and if you require the same thing again and again in different frames
Is There any way by which we can show the total
Thanks in advance
CSJakharia

Can I maintain a sum of a column in a JTextField such that I change the sum as soon as any value in that column is changed without recalculating the totalYes, now I understand the question you just want to update the total with the difference between the old value and the new value.
I don't see why you are going to all this trouble. Why complicate your program, just loop though all the values in each column and add them together. You will not have a performance problem. Here is a similiar example of this approach:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=566133
However, if you still don't like that solution then you can try overriding the getCellEditor(...) or prepareEditor(...) methods of JTable. These methods should be invoked when you start editing the cell and you could query the TableModel and save the current value.

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JTable get Old Value in the Listener of change Value

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