可根据用户需要建立间隔时间，每隔一定时间数数加一。期间有自动检错功能。-a class called SleepyCounter that implements the Runnable interface.

The class should behave like Counter, except that after each output it should

sleep for 0.01 second.a class called CounterApp with main() method, create one Counter

thread and one SleepyCounter thread and start both of them.