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今日收获 理解并学习了如何使用定时器完成设置每天早上八点程序执行一次 可自行扩展：
public void TimerTaskTest{ // 创建一个定时器任务 TimerTask timerTask = new TimerTask()
{ @Override public void run() { /*写业务逻辑主体 system.out.prinln("早上八点叫我起床"); */ }
}; //设置执行时间 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08:00:00执行，
calendar.set(year, month, day, 8, 00, 00); Date date = calendar.getTime(); //
创建定时器 Timer timer = new Timer(); //设置的定时器 period(每隔多长时间运行几次) 单位毫秒
timer.schedule(timerTask, date); }
我感觉 其实和最原始的定时器没什么区别 应该是通过calender这一部分把你设置的时间和现在从系统获取的时间进行减法
求出还有多长时间到你设定的时间 然后利用定时器 延时这么长的时间执行 不过我有一个疑问 计算时间差 是每天执行一次还是只有你第一次执行的时候只计算一次
那么这样时间是不是会越来越有偏差呢？
