Stop a stopwatch

Question

I have the following code in a JPanel class which is added to a another class (JFrame). What I\'m trying to implement is some sort of a stopwatch program.

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Answer 1

long startTime = System.currentTimeMillis();
    Timer timer = new Timer(100,new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent arg0) {
            long elapsedTime = System.currentTimeMillis()-startTime;
            long mil = elapsedTime%1000;
            long sec = elapsedTime/1000%60;
            long min = elapsedTime/60000%60;
            long hr = elapsedTime/3600000;
            label.setText(String.format("%02d:%02d:%02d.%03d", hr,min,sec,mil));
        }
    });
    timer.start();