设计的文件系统实现下述的基本操作:建立文件;删除文件;打开文件;关闭文件; 可对文件设置保护措施(读,写,执行)。-the file system is designed to implement basic operations as follow:
create file
delete file
open file
close file
set security measure
多态性和复习的相关文件!!!好老火,要限制字数!!!防撒发生发生发生发撒-polymorphism and review of the relevant documents! ! ! Good old fire, to restrict the number of words! ! ! Anti-spreading occurred happened happened fat spreading