一个简单的时钟，利用线程控制其时针，分针，和秒针的走向。界面也算漂亮，还没有实现与体统时间的同步，忘高手指教。当然本人也在思考之中。-A simple clock, the clock to control its use of thread, minute hand, and the direction of the second hand. Operator interface is also beautiful, there is no time to achieve synchroniz