Java3-class Student

1  PackageOne ;2 ImportJava.util.*;3 Importjava.text.*;4 classperson{5      PublicString name;6      PublicDate birthday;7      PublicString sex, province,city;8     Private Static intCount=0;9      PublicPerson (String name,date birthday,Ten String sex,string province,string City) { One          This. name=name; A          This. birthday=birthday; -          This. sex=sex; -          This. province=Province; the          This. city=City ; -     } -      PublicPerson (String name,date birthday) { -          This(Name,birthday, "", "", ""); +     } -      PublicPerson () { +          This("",NULL); A     } at      PublicPerson (person p) { -          This. Set (p.name,p.birthday,p.sex,p.province,p.city); -     } -      -      Public voidFinalize () { -System.out.println ("Release object (" + This. toString () + ")"); inperson.count--; -     } to      PublicString toString () { +         returnName+ "," + (birthday==NULL? "": birthday.tostring ()) + "," + -(sex==NULL? "": Sex) + "," + (province==NULL? "":p rovince) + the(city==NULL?"": City); *     } $      Public voidSet (String name,date birthday,string sex,string Province,Panax Notoginseng String City) { -          This. name=name==NULL?"": Name; the          This. sex=sex==NULL?"": Sex; +          This. province=province==NULL?"":p rovince; A          This. city=city==NULL?"": City; theCalendar calendar=NewGregorianCalendar (0000,00,00,0,0,0); +Date date=calendar.gettime (); -          This. birthday=birthday==NULL?Date:birthday; $     } $      Public Static voidHowmany () { -System.out.println (person.count+ "Person Object"); -     } the } - Wuyi  Public classStudentextendsPerson { the      PublicString Department; -      PublicString number; Wu      PublicString speciality; -      Public Booleanmember; About     Private Static intCount=0; $      PublicStudent (String name,date birthday,string sex,string Province, - String city,string number,string department,string speciality, -             Booleanmember) { -         Super. Set (name, birthday, sex, province, city); A          This. Set (Number,department,speciality,member); +count++; the     } -      Public voidSet (String number,string department,string specilality, $             Booleanmember) { the          This. number=number==NULL?"": number; the          This. department=department==NULL?"":d epartment; the          This. speciality=speciality==NULL?"": Speciality; the          This. member=member; -     } in      Public voidFinalize () { the         Super. Finalize (); thestudent.count--; About     } the      PublicStudent (person p,string number,string department,string speciality, the             Booleanmember) { the          This(P.name,p.birthday,p.sex,p.province,p.city,number,department, +Speciality,member);//There is no point behind this -     } the      PublicStudent (Student s) {Bayi          This(S.name,s.birthday,s.sex,s.province,s.city,s.number, the s.department,s.speciality,s.member); the     } -      Public Static voidHowmany () { - Person.howmany (); theSystem.out.println (student.count+ "Student objects"); the     } the      PublicString toString () { the         return Super. toString () + "," +department+ "," +speciality+ "," +number+ -"," + (member? ") Member ":"); the     } the      Public Static voidMain (string[] args) { the         //TODO auto-generated Method Stub94  the     } the  the}

Java3-class Student