Locking a whole row while editing in a JTable

I have a JTable with 4 columns that are required. When a users finishes one cell, they can click out of the row. I want to force the user to fill in all values before they can continue. Is this possible?

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Create a popup dialog to add a new row of data to the table. Then the dialog "Save" button can check to make sure all four fields are filled in.