自己做的小系统、学生管理系统、实现对数据的增删改查、每次操作都保存数据至文件、同时包含碎片整理功能。模拟windows的基本文件操作。-Own system, student management system, the CRUD data, each operation to save the data to a file that contains both the defragmentation function. The basic file operations simulation