타이머 사용

  public static void main(String[] args) {
        TimerTask task = new TimerTask() {
            @Override
            public void run() {
                System.out.println("Hello, stranger");
            }
        };
        Timer timer = new Timer();
        //           ---    5  
        // 1000ms = 1s
        long delay = 0;
        //            
        long intevalPeriod = 5 * 1000;
        // schedules the task to be run in an interval
        //             
        timer.scheduleAtFixedRate(task, delay, intevalPeriod);

    }