实现学生信息的录入，查找，删除，修改等操作，使用了两个类Student和Exstudent,List来实现存储，较数组和链表来说很方便。对于学生信息可以自己扩展。-Student Information realize the entry, find, delete, modify, such as the operation, use two categories of Student and Exstudent, List to realize storage, representing an array and linked list is very convenient. Information for students can expand their own.