java 定时器

   //时间间隔(一天)   

    private static final long PERIOD_DAY = 24 * 60 * 60 * 1000;   

    public void executeTask(){ 

        Timer timer = new Timer(); 

        Calendar calendar = Calendar.getInstance(); 

        int year = calendar.get(Calendar.YEAR); 

        int month = calendar.get(Calendar.MONTH); 

        int day = calendar.get(Calendar.DAY_OF_MONTH);// 每天 

        // 定制每天的03:30:00执行， 

        calendar.set(year, month, day, 03, 30, 00); 

        Date date = calendar.getTime(); 

        if (date.before(new Date())) {   

            date = this.addDay(date, 1);   

        }  

        timer.schedule(new MyTask(), date, PERIOD_DAY); 

    } 

    static class MyTask extends java.util.TimerTask { 

        @Override 

        public void run() { 

            System.out.println("----Start execute my task------");      

        } 

    }