java计时器

//用于计时，要求xx秒后开始发送短信，短信之间间隔xx秒
public static Date dateOperateBySecond(Date date,int second){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date == null ? new Date() : date);
        calendar.add(Calendar.SECOND, second);
        return calendar.getTime();
    }