title: How to set JSpinner to display "Infinite" when the value is -1?
body: <p>I have a JSpinner and it counts down from n to 0. However, if the value is -1, I want that number to be hidden and instead display "Infinite" or "∞" instead. When I retrieve the value, it'll still read as -1.</p>
  
  <p>Is this possible, and by using a SpinnerNumberModel?</p>
  
  <p>Thanks,</p>
  
  <p>Ant</p>