是一个用Java写的学生管理系统的源代码，没有用到数据库，先要登陆，用户名、密码都是aaa,具有增加、修改、查询、删除成绩的功能-Is a student used to write Java source code management system, did not use the database, first login, user name, password is aaa, with the increase, modify, query, delete the function o