If I set a timer to execute a code every 3 seconds. If the code isn't finished in 3 seconds, what will happen? The computer will terminal the code or wait for the code finish or continue the timer, and execute the code with the unfinished code concurrently.

int delay = 0;   // delay for 0 sec.
int period = 3000;  // repeat 3 sec.
Timer timer = new Timer();

timer.scheduleAtFixedRate(new TimerTask() {
        public void run() {
            // Task here ...
            // It may take more than 3 sec to finish, what will happen?
        }
    }, delay, period);