automatically select jtable cell data

[excession]

when a user clicks on a cell in a jTable, how do you automatically select the data so that it can be edited? At the moment, when a cell is selected the cursor is placed at the end of the data string which mean the user has to delete the current contents before entering new data, I want to be able to have the data ready selected so the user can just type the new data.

Thanks in advance