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

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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。

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