输入学生信息，包括学号/姓名/年龄，依次输入一个学生信息，

格式如下：Scanner

1，张三，20

输入完学生信息后，输入over代表结束

要求：保存所有学生的信息（List），并计算出平均年龄

学生类/Test(main)

封装/多态/重写equals hashCode toString/List/Integer

正则校验/字符串拆封

-Enter student information, including Student ID/name/age, followed by a student enter the information in the following format: Scanner 1, Zhang San, 20 students finished entering information, type over on behalf of the end of requirements: keep all student information (List), and calculate the average age of students in class/Test (main) Package/Multi-state/override equals hashCode toString/List/Integer regular checking/string shrink-wrap