//主函数，主要是用于启动用于模拟虚存活动和进行监控的两个线程；-/ / main function is mainly used to launch virtual memory used to simulate and monitor activities of the two threads;

小球碰撞，出现不同颜色，有不同发射角度与速度，是弹性碰撞-Ball collision, there are different colors, different launch angles and speed, is the elastic collision