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 waiting to read and write the number, the number of read and write operation.