这是一个模拟缓存区管理程序，读写页时，先去缓冲区里找，若没有，从磁盘中调文件到缓冲区，然后找到要操作的页，若有，直接从缓冲区里取页进行操作。使用50万个测试数据来测试，最后统计处去磁盘中调文件的次数，以此来检测缓冲区的功效-This is a simulation of buffer zone management program, read and write page, go to the buffer where to find, if not, transfer the file from the disk to the buffer, and then find the page to operate, if any, taken directly from the page buffer operation. Using 500,000 test data to test, and finally to the disk and Statistics Department, the number of transferred files, in order to test the effectiveness of the buffer