学生管理系统、以java语言编写，基于mysql、源码奉上-Student management system, to the Java language, based in mysql, source code

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C#继承公共接口的代码，实现思路：Program program = new Program() 实例化类对象，使用派生类对象实例化接口ITeacher，使用派生类对象实例化接口IStudent。-C# to inherit public interface code, realization of ideas: Program program = new Program () instantiated class object, u