Trouble in table updating when getting focus or mousemove over a table.

Question

I have JTable and dynamically updating data in mymodel by using
mymodel.addTableModelListener(Table) through fireTableRowsInserted()
and fireTableRowsUpdated() method of AbstractTableModel.It just work
fine, the problem is when i move mouse over a table or restoring the
window the getValueAt(row,column) method is called repeatdly to
corresponding row and column , then the value in that cell is changing.
I incremented the value of the cell basing on perticular condition.When
i move mouse over the table or restored then the value of the cell is
incrementing repeatedly .Can any body give the solution , when i moved
the mouse over a table or restore the window the value of corresponding
cell has not to increment.
Regards,
Sreedhar.A

Answer 1

It sounds like you do not have your table model implemented properly.
The getValueAt() method should always return the proper value for a cell from the model data. It gets called all the time and you have no control over when it is called. You must make sure that it will always return the proper data given the params passed to the method.
AFTER you update the data underlying the model you should fire the proper event. Then the table (view) will repaint the impacted cells (by calling a number of other methods, including the getValueAt method).
Subclass AbstractTableModel, implement all the required methods. When implementing the methods, remember that you cannot guess in what order or how the methods will be called. Just make sure they always return the proper thing. Also make sure you fire the appropriate event when you modify the underlying data in the model.