java----类的继承 以学生类为题

定义一个学生类，有学生类派生出小学生初中生高中生大学生研究生四个类，其中大学生类再派生出一个本科生专科生两个子类，研究生再派生出硕士生和博士生两个子类

所有类：

//学生类class student {int id;int classes;char sex;int year;public student(int id1, int classes1, char sex1, int year1) {this.id = id1;this.classes = classes1;this.sex = sex1;this.year = year1;}public void print(){System.out.println("学生类:"+id+" "+classes+" "+sex+" "+year+" ");}}// 小学生class Primary extends student {public Primary(int id1, int classes1, char sex1, int year1) {// TODO Auto-generated constructor stubsuper(id1, classes1, sex1, year1);}public void print_Primary(){System.out.println("小学生类:"+id+" "+classes+" "+sex+" "+year+" ");}}// 初中生class Junior extends student {public Junior(int id1, int classes1, char sex1, int year1) {// TODO Auto-generated constructor stubsuper(id1, classes1, sex1, year1);}public void print_Junior(){System.out.println("初中生类:"+id+" "+classes+" "+sex+" "+year+" ");}}// 高中生class High extends student {public High(int id1, int classes1, char sex1, int year1) {// TODO Auto-generated constructor stubsuper(id1, classes1, sex1, year1);}public void print_High(){System.out.println("高中生类:"+id+" "+classes+" "+sex+" "+year+" ");}}// 大学生class College extends student {String vb,java;public College(int id1, int classes1, char sex1, int year1,String v,String j) {// TODO Auto-generated constructor stubsuper(id1, classes1, sex1, year1);vb=v;java=j;}public void print_College(){System.out.println("大学生类:"+id+" "+classes+" "+sex+" "+year+" "+vb+" "+java+" ");}}// 专科class College_Junior extends College {public College_Junior(int id1, int classes1, char sex1, int year1,String v,String j){super(id1, classes1, sex1, year1,v,j);}public void print_Junior(){System.out.println("专类:"+id+" "+classes+" "+sex+" "+year+" "+vb+" ");}}// 本科class College_High extends College {public College_High(int id1, int classes1, char sex1, int year1,String v,String j){super(id1, classes1, sex1, year1,v,j);}public void print_High(){System.out.println("本类:"+id+" "+classes+" "+sex+" "+year+" "+java+" ");}}// 研究生class Graduate extends student {public Graduate(int id1, int classes1, char sex1, int year1) {// TODO Auto-generated constructor stubsuper(id1, classes1, sex1, year1);}public void print_College(){System.out.println("研究生类:"+id+" "+classes+" "+sex+" "+year+" ");}}// 硕士生class Graduate_Master extends Graduate {public Graduate_Master(int id1, int classes1, char sex1, int year1) {// TODO Auto-generated constructor stubsuper(id1, classes1, sex1, year1);}public void print_Master(){System.out.println("硕士生类:"+id+" "+classes+" "+sex+" "+year+" ");}}// 博士生class Graduate_Doctoral extends Graduate {public Graduate_Doctoral(int id1, int classes1, char sex1, int year1) {// TODO Auto-generated constructor stubsuper(id1, classes1, sex1, year1);}public void print_Doctoral(){System.out.println("博士生类:"+id+" "+classes+" "+sex+" "+year+" ");}}

 

测试函数 main（）：

public class mMain {public static void main(String[] args){System.out.println("xx类： 学号     班级     性别     年龄");student s1=new student(23, 1111, '男', 21);s1.print();Primary p1=new Primary(23, 1111, '男', 21);p1.print_Primary();Junior j1=new Junior(23, 1111, '男', 21);j1.print_Junior();High h1=new High(23, 1111, '男', 21);h1.print_High();College c1=new College(23, 1111, '男', 21,"vb.net","java");c1.print_College();College_Junior cj1=new College_Junior(23, 1111, '男', 21,"vb.net","java");cj1.print_Junior();College_High ch1=new College_High(23, 1111, '男', 21,"vb.net","java");ch1.print_High();Graduate g1=new Graduate(23, 1111, '男', 21);g1.print_College();Graduate_Master gm1=new Graduate_Master(23, 1111, '男', 21);gm1.print_Master();Graduate_Doctoral gd1=new Graduate_Doctoral(23, 1111, '男', 21);gd1.print_Doctoral();}}

 

运行效果：