用Java编写的读者写者问题的模拟程序，基本功能读读允许，读写互斥和写写互斥都实现了，界面输出是等待的读写者数目，运行的读写者数目．-Using Java to prepare readers to write the simulation program problem, the basic functions of read permission, read and write and write about mutex mutex achieved, interface output is