这是一个比较完整的java语言编写的文件系统程序，有8个基本功能，要求设计一个N个用户的文件系统，每次用户可以保存M个文件，用户在一次运行中只能打开一个文件，对文件必须设置保护措施。且至少有Create,Delete,Open,Read,Write等命令。-This is a relatively complete java language file system procedures, eight basic functions, N designed a user's file system, each time a user can save M documents, users in an operation to open only one document, the document must install protective measures. But at least Create, Delete, Open, Read, Write, etc. order.