Implementing javax.swing.timer instead of javax.util.timer

Hello,
i would like to implement my method with javax.swing.timer instead of java.util.timer because i need to be able to stop my timer.

this is my method with java.util.timer:

if(event.getSource() == this.random)
             if (difficulty == "Einfach" || difficulty == "Mittel" || difficulty == "Schwer"){
               if (timerzahl == 1){
                   hours =   0;
                   minutes = 0;
                   seconds = 0;
                }
                else{
            {TimerTask timerTask = new TimerTask() {
                
                 DecimalFormat df = new DecimalFormat("00");
                 
                
                         
                  @Override
                  public void run() {
                         seconds++;
                         if(seconds > 59){
                             seconds = 0;
                             minutes++;
                         }
                        if(minutes >59){
                            minutes = 0;
                            hours++;
                        }
                        uhr.setText(df.format(hours) + ":" + df.format(minutes)
                        + ":" + df.format(seconds));
                }
               
            };
            timer.schedule(timerTask, new Date(), 1000);
            }
           }
            timerzahl = 1;
        }

and i would like to be able to do the same thing with javax.swing.timer but i dont know how to do that, could someone help me?
this method is to implement a working clock into my programm