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JTable problem

 
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hi,

when i use the DefaultTableModel like this:
DefaultTableModel df = new DefaultTableModel()
i can add rows and columns to the table using addColumn and addRows method.
But when i use this class to load my JTable with data from the database, i can not
add rows and columns.
How can i add rows to the JTable when i use my own class that extends DefaultTableModel to load the JTable with
data from the database!

thanks.
 
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