GUI with JTable consulting

Just wonder if JTable can manipulate data in the following manner:
Say the table is constructed with:
1.     image (think of arrows)
2.     Gender
3.     Name
4.     Comment
example:
--> M Dan Cortland Canada
<-- M Mike Radford Canada
<-- F John Lock USA
�     The image aren�t ascii and they suppose to be in a dropdown menu.
�     The names are taken from the database (comboBox)
�     The comments suppose to be editable.
My question is this:
1.     Say the user input information and then realizes he made a mistake. Now he wants to insert a row in the middle - how can he do that (while pushing all rows one level down)?
2.     how can the size of the table be determine in runtime (the user wants to add another row)
If anyone believe this is not the way to consturct it (not with a JTable) please advise.
thanks for any pointers

yes, this solves most of the problems (thanks)
I wonder what if the user wants to insert a row in the middle and push all other below?
thanks camickr

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