如何在n秒后停止摆动计时器？

Question

I'm trying to make an image twinkle with RaffleImage(); while I'm executing the timer, my character is immune to any collision, I want it to be immune only for 2 seconds, so the timer get execute only for 2 seconds and then get finished.

I've tried subtracting System.currentTimeMillis() but any variable I create from this method, have always the same value, making me get a zero from that subtracting.

Do you know how I can stop or pause the timer after any elapsed time in seconds?

immuneTimer = new Timer(50, new ActionListener() {  
        @Override
    public synchronized void actionPerformed(ActionEvent e) {
    long initMillis = System.currentTimeMillis();
     if (System.currentTimeMillis() - initMillis > 2000 ) { // this substract gives me 0
        initImages();
        setImmune(false); // so this never reached
        immuneTimer.stop();
      } else {
            raffleImage(); //its executing like forever;
             }
      }
});

Answer 1

The Swing timer fires a an ActionEvent . From the event you can use getSource() to get the source of the event. Cast that source to the swing timer object and use that to turn it off.

To know when to turn it off you need to have a variable count the number of times the swing timer is invoked. When the variable reaches that amount, turn it off.

int elapsedTime = 0;
int timerDelay = 50;
int max = 2000;
public void actionPerformed(ActionEvent ae) {
     elapsedTime += timerDelay; // you could use getDelay here but it
                                // is in milliseconds.
     if (elapsedTime >= max) {
        Timer s = (Timer)ae.getSource();
        s.stop();
     }
     // rest of code
}