淮海工学院计算机工程学院实验报告书课程名：《Java语言实验与课程设计指导》题目：实验3——深入面向对象编程班级：学号：姓名：实验题目：1.定义一个学生类，定义一个大学生类和小学生类，这两个类是学生类的子类；定义一个选课接口，由大学生类实现该接口，定义一个年龄异常处理，当小学生年龄小于7岁时，弹出异常。

2.定义一个银行卡类，定义一个信用卡类和普通银行卡类，这两个类是银行卡类的子类；定义一个透支的接口，信用卡可以透支，普通银行卡不可以透支。

定义一个取款异常和透支异常，当普通银行卡取款超过银行卡余额时，弹出“取款异常”；当信用卡透支超过2万元时弹出“透支异常”。

实验代码：题1源代码：import java.awt.*;class student{String number,name,sex,bj;int age;student(String xuehao,String xingming,String xingbie,int nianling,String banji){number=xuehao;name=xingming;sex=xingbie;age=nianling;bj=banji;}}interface xuanke{abstract void select(String s);}interface illegal{abstract void illegal(int s);}class primary extends student implements illegal{String xx;primary(String xuehao,String xingming,String xingbie,int nianling,String banji,String xiaoxue){super(xuehao,xingming,xingbie,nianling,banji);}public void illegal(int s){age=s;if(age<7)System.out.println("\n出错~学生"+name+" 的年龄过小！");}}class college extends student implements xuanke{String dx,xk;college(String xuehao,String xingming,String xingbie,int nianling,String banji,String daxue){super(xuehao,xingming,xingbie,nianling,banji);dx=daxue;}public void select(String s){xk=s;}}public class test_1{public static void main(String args[]){primary p1=new primary("1","张三","男",13,"五(1)班","ZZZ小学");System.out.println(p1.number+" "++" "+p1.sex+" "+p1.age+" "+p1.bj+" "+p1.xx);p1.illegal(p1.age);primary p2=new primary("\n2","小红","女",6,"一(1)班","YYY小学");System.out.println(p2.number+" "++" "+p2.sex+" "+p2.age+" "+p2.bj+" "+p2.xx);p2.illegal(p2.age);college c1=new college("3","小茗","女",20,"软件112","XXX大学");c1.select("现代密码学");System.out.print("\n"+c1.number+" "++" "+c1.sex+" "+c1.age+" "+c1.bj+" "+c1.dx+" "+c1.xk+"\n");}}实验结果：题2源代码：import java.util.*;class bankcard{String kh,name;double yue;bankcard(String kahao,String yezhu,double shengyu) {kh=kahao;name=yezhu;yue=shengyu;}}interface touzhi{abstract void tz(double s);abstract void tzye(double s);abstract void illegal();}interface qkillegal{abstract void illegal();}class common extends bankcard implements qkillegalcommon(String kahao,String yezhu,double shengyu){super(kahao,yezhu,shengyu);}public void warning(){System.out.println("普通银行卡不可透支！");}public void illegal(){System.out.println("取款超额！");}}class xinyongka extends bankcard implements touzhi{double tzye;xinyongka(String kahao,String yezhu,double shengyu){super(kahao,yezhu,shengyu);}public void tz(double s){tzye=s;}public void tzye(double s){double t=20000+yue-s;if(s>yue)System.out.println(t);}public void illegal(){System.out.println("透支超额！");}}public class test_3{public static void main(String args[]){common c1=new common("62226200240001916658","张三",1200.00);System.out.println("卡号:"+c1.kh+"业主:"++"余额:"+c1.yue);System.out.println("请输入取款金额:");Scanner s1=new Scanner(System.in);double b=s1.nextDouble();if(b<c1.yue){double c=c1.yue-b;System.out.println("银行卡余额为:"+c);}elsec1.illegal();System.out.println("\n\n");xinyongka x1=new xinyongka("62236200243008615559","李四",500.00);System.out.println("卡号:"+x1.kh+"业主:"++"余额:"+x1.yue);System.out.println("信用卡可透支！透支金额为20000元！");System.out.println("请输入要取款金额:");Scanner s2=new Scanner(System.in);double a=s2.nextDouble();if(a<=x1.yue){double d=x1.yue-a;System.out.println("银行卡余额为:"+d);}else if(a>x1.yue&&a<=(20000+x1.yue)){System.out.println("透支余额剩余:");x1.tzye(a);}elsex1.illegal();}}实验结果：普通银行卡类：输入普通银行卡取款金额若输入金额小于余额则若大于余额则信用卡类：输入取款金额，若输入金额小于余额则若输入金额大于余额小于透支金额与余额之和，则若大于透支金额与余额之和，则。