定时任务（Java）

//指定延迟时间执行定时任务
public class TimeWork
{
    Timer timer;

    public  TimeWork(int time)
    {
        timer =new Timer();
        timer.schedule(new TimerWork(),time *1000);
    }

    public static void main(String[] args) {
        System.out.println("timer begin....");
        System.out.println("系统自动摧毁计划将在10秒后执行");
        new TimeWork(10);
    }

    public class TimerWork extends TimerTask
    {
        public void run(){
            System.out.println("Time's up!!!");
            System.out.println("系统以摧毁");
        }
}

}


//----------------------------------------------------------------------------------------------

//在指定时间执行定时任务
public class ZDTime {
    Timer timer;

    public ZDTime() {
        Date time = getTime();
        System.out.println("指定时间 Time" + time);
        timer = new Timer();
        timer.schedule(new ZDTimes(), time);
    }

    //到11点执行线程任务
    public Date getTime() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 11);
        calendar.set(Calendar.MINUTE, 00);
        calendar.set(Calendar.SECOND, 00);
        Date time = calendar.getTime();
        return time;
    }

    public class ZDTimes extends TimerTask {
        @Override
        public void run() {
            System.out.println("指定时间摧毁目标");
        }
    }

    public static void main(String[] args) {
        new ZDTime();
    }
}

//----------------------------------------------------------------------------------------------

 

//时间已经超过啦不执行或者换成明天执行
public class LaterTime
{
public  void  timeRun(){
    //一天的毫秒数
    long msec = 24*3600*1000;
    //规定的每天时间。。运行
    SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd 12:00:00");
    //首次运行时间
    try {
        Date fristStartTime =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(sdf.format(new Date()));
        //如果今天时间已过 首次运行时间就改为明天
        if(System.currentTimeMillis()>fristStartTime.getTime())
        {
            fristStartTime=new Date(fristStartTime.getTime()+msec);
        }
        Timer timer=new Timer();
        TimerTask task=new TimerTask() {
            @Override
            public void run() {
                System.out.println("定时任务执行");
            }
        };
        //以每24小时执行一次
        timer.schedule(task,fristStartTime,msec);
    } catch (Exception e) {
        e.printStackTrace();
    }

}

    public static void main(String[] args) {
        new LaterTime().timeRun();
    }
}