title: Make the JTable cell ready to be overwritten
body: <p>I have a button which inserts a single column row into a JTable with the text: 
  "New notes: ". I want this text ready to be overwritten as soon as the user starts typing on this cell (rightafter the button-press). How to make the JTable's cell ready to be overwritten? How can this be done? </p>
  
  <p>Thank you!</p>