Well there are KeyListeners that you can use, but there is also ListSelectionListener. You need to create a class that implements one of these interfaces, provide the necessay method, get the Jatable make sure they are already on the last row, if it is, call the requestFocus() method of the component you want to grab the focus.
That is the overview, the specific details you will need to look at the api to get.
If not, then don't implement that, you won't get docked points if you don't have it tab out of the JTable.
Mark