static void Main(string[] args)
{
Console.WriteLine("请设置闹钟的响铃时间(以hh:mm:ss格式设置");
string clock_time;
clock_time = Console.ReadLine();
Clock clock = new Clock();
Alarm alarm = new Alarm(clock);
Tick tick = new Tick(clock);
Thread thread_1 = new Thread(clock.On);
thread_1.Start();
clock.On2(clock_time);
}
