编写一个Student类：该类拥有属性：校名，学号，性别，出生日期。方法包涵设置姓名和成绩

编写一个Student类：该类拥有属性：校名，学号，性别，出生日期。方法包涵设置姓名和成绩（setName（），setScore（））。再编写Student类的子类，Undergraduate（大学生）。Undergraduate类除了拥有父类属性和方法外，还有其他自己的属性和方法：附加属性包括系（department）,专业(major)；方法包涵设置系别和专业。（setDepartment(),setMajor()）。public class Student {
String school;
int studentNumber;
String gender;
String birthdate;
String name;
int score;
void setName(){
System.out.println("姓名："+name);
}
void setScore(){
System.out.println("成绩："+score);
}
public static void main (String[] args){
Undergraduate under1 = new Undergraduate();

under1.school="河南农业大学";
under1.studentNumber=1610113000;
under1.gender="一年级";
under1.birthdate= "1999.02.02";
under1.name="Tom";
under1.score=99;
under1.department="信管";
under1.major="软件";
under1.setName();
System.out.println("生日："+under1.birthdate);
System.out.println("年级："+under1.gender);
System.out.println("学校："+under1.school);
System.out.println("学号："+under1.studentNumber);
under1.setScore();
under1.setDepartment();
under1.setMajor();
}
}
class Undergraduate extends Student {
String department;
String major;
void setDepartment(){
System.out.println("系别："+department);
}
void setMajor(){
System.out.println("专业："+major);
}

}还可以把
public ststic void........放到Undergraduate里面。