多线程活动球java 程序,便于理解Multi-Threaded 的功能.-Simple Drawing Application in Java, bouncing Ball application is developed in Java with multi-threading functions

使用JAVA实现一个跳动的球，在触地的一瞬间，球还有被压扁的现象，用a键将球左移，S键将球右移。-JAVA realization of a beating with the ball, hit the ground at the moment, there is flattening of the phenomenon of the ball, the ball left with a key, S key to the ball right.