JTable specified row

changeSelection(int rowIndex,int columnIndex,boolean toggle,boolean extend) 

toggle: false, extend: false. Clear the previous selection and ensure the new cell is selected.  

toggle: false, extend: true. Extend the previous selection to include the specified cell. 

toggle: true, extend: false. If the specified cell is selected, deselect it. If it is not selected, select it. 

toggle: true, extend: true. Leave the selection state as it is, but move the anchor index to the specified location. 

reference:
javaworld, java 1.4.2 api