student类

方法的功能和含义：getStudentId（获得学号）；

getClassId（获得班号）；getStudentName（获得学生姓名）；

getStudentSex（获得学生性别）；getStudentAge（获得学生年龄）；

setStudentAge（修改学生年龄）。-student class method function and meaning: getStudentId (Student ID to obtain)　getClassId (access to its classes)　getStudentName (student name)　getStudentSex (student gender)　getStudentAge (student age)　setStudentAge (modified age students).