多线程的程序框架，该程序实现了3个线程，其中第一个线程实现了秒表功能，第二个线程是个进度条，第三个线程测试系统最多能生产多少个线程-Multi-threaded application fr a mework, the program achieved three threads, where the first thread to achieve a stopwatch function, the second thread is a progress bar, a third thread