定义一个表示学生的student类，包括的域有学号、姓名、性别、年龄，包括的方法有获得学号、姓名、性别、年龄及修改年龄。编写Java程序创建student类的对象及测试其方法的功能。-Define a said the student class, students have student id, including domain name, sex, age, including method with a student id, name, sex, age and modify age. Compile Java program creates student objects of a class and test their way to function.