Just make an instance of the imageicon u want to display and try with the following JTable's method. Hope it will work :
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public void setValueAt(Object aValue,
int row,
int column)
Sets the value for the cell in the table model at row and column.
Parameters:
aValue - the new value
row - the row of the cell to be changed
column - the column of the cell to be changed
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let me know if it does...
till then
Yogesh