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 of performance