满足三级用户权限的学生成绩管理系统，图形化管理界面，注：数据库创建包含于java代码中，可自行使用创建，数据库初次使用内部数据请自行添加(To meet the level three user permissions student achievement management system, graphical management interface, note: database creation is included in the Java code, you can use you