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B&S question on data access and gui

+Pie Number of slices to send: Send
Do I have to implement add() method provided by SUN? Because I was not planning to do any add on gui. and by update(), can I just prompt the user to enter customer ID to book the contractor.

1 more. why the field name is sub contractor name not contractor name?

sorry for asking so many questions, i am starting out on this cert. and have alot of confusion.
+Pie Number of slices to send: Send
Fei,

you have to implement all methods provided by Sun's interface regardless of whether you will support them in the GUI or not (you shouldn't really support them in the GUI).
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