My own JTextField

Question

In a fitness database that I am developing I am hoping to have a JTextField that the user can enter the duration of their workout. I want the format to be preset to 00:00, and the user would just enter in number that would fill in accordingly.
Should I write my own class that extends JTextField or is there a better way to do this?
Thanks in advance for any input!

Answer 1

Thank you for your timely response. Despite my username disclaimer, I feel foolish for not having found that myself!
Anyway, as expected, I have run into some problems now with the JFormattedTextField. Here is the relevant code:
class WorkoutDefPanel extends JPanel
    MaskFormatter mf = new MaskFormatter();
    JFormattedTextField woDur = new JFormattedTextField(mf);
    public WorkoutDefPanel()
     woDur.setLocation((int)(frameW * 0.28),(int)(frameH * 0.25));
     woDur.setSize((int)(frameW * 0.06),(int)(frameH * 0.05));
     //duration text field's input mask
     try{
         mf.setMask("#:##");
         mf.setPlaceholderCharacter('0');
         mf.setValueContainsLiteralCharacters(false);
     }catch(ParseException ex){}
     add(woDur);
    //this is called from my JFrame class when the user selects a "LOG" button
    public void log()
     int t = 0;
     try{
         mf.commitEdit();
         t = Integer.parseInt(mf.valueToString(woDur.getValue()));
     }catch(ParseException ex){}
     int d = ((t/100)*60)+(t % 100);
     Workout nw = new Workout(d);
}I am getting a NumberFormatException at t = Integer.parseInt(mf.valueToString(woDur.getValue()));Also, strangely, the value which throws the exception is 0:00 even after it has been edited. The value only changes to the edited value once enter is pressed, but I still get the runtime exception.
Any thoughts?
Appreciated,
Jeremy