Java程序设计-试验3(学生版)

1、华北电力大学实验报告实验名称Java程序面向对象设计（二）学生姓名： 成 绩: 实验日期:课程名称Java程序设计专业班级：学 号：指导教师：张学斌一、实验目的及要求1. 掌握类的继承。2. 掌握类的隐藏和覆盖。3. 掌握抽象类和抽象方法二、试验内容实验1中国人、北京人和美国人1 实验要求编写程序模拟中国人、美国人是人，北京人是人。出主类外，程序中还有4个类：People、ChinaPeople、AmericanPeople 禾口 BeijingPeople 。要求如下：People 类有权限是 protected 的 double 型成员变量 height 和 weight,以及 publi

2、c void speakHello() 、public void averageHeight()禾口 public void averageWeight() 方法。ChinaPeople 类是 People 类的子类，新增了 public void chinaGongfu()方法，要求Chinapeople 重写父类的public void speakHello() 、public void averageHeight() 禾口public void averageWeight() 方法。AmericanPeople 类是 People 的子类，新增public void americanBo

3、xing()方法。要求Americanpeople 重写父类的 public void speakHello() 、public void averageHeight() 禾口 public void averageWeight() 方法。BeijingPeople 类是 Chinapeople 的子类，新增 public void beijingOpera()方法。要求ChinaPeople 重写父类的 public void speakHello() 、public void averageHeight() 禾口 public void averageWeight() 方法。2 .程序模板

4、People.javapublic class People protected double weight,height;public void speakHello() System.out.pri ntl n(yayayaya);public void averageHeight() height=173;System.out.println(average height:+height);public void averageWeight() weight=70;System.out.pri ntln (average weight:+weight);Chin aPeople.java

5、public class Chin aPeople exte nds People public void speakHello() System.out.pri ntln (您好)；public void averageHeight() height = 168.78;System.out.println(”中国人的平均身高：+height+厘米);【代码1】/重写public void averageWeight() 方法，输出:中国人的平均体重：65公斤 public void chinaGon gfu() System.out.println(”坐如钟，站如松，睡如弓);America

6、 nPeople.javapublic class America nPeople exte nds People 【代码 2 】/ 重写 public void speakHello() 方法，输出How do you do【代码 3】/ 重写 public void averageHeight() 方法，输出Americans average height:176 cm public void averageWeight() weight = 75;System.out.println(Americans average weight:+weight+ kg);public void am

7、erica nBox in g() System.out.pri ntl n(”直拳、钩拳、组合拳);Beiji ngPeople.javapublic class Beiji ngPeople exte nds Chin aPeople 【代码4】/重写public void averageHeight() 方法，输出:北京人的平均身高：172.5 厘米【代码5】/重写public void averageWeight() 方法，输出:北京人的平均体重：70公斤 public void beiji ngOpera() System.out.pri ntl n(”花脸、青衣、花旦和老生 ”)；

8、Example.javapublic class Example public static void main(String args) Chin aPeople chin aPeople=new Chin aPeople();America nPeople america nPeople=new America nPeople();BeijingPeople beijingPeople=new BeijingPeople();chi naPeople.speakHello();america nPeople.speakHello();beiji ngPeople.speakHello();

9、chi naPeople.averageHeight();america nPeople.averageHeight();beiji ngPeople.averageHeight();chi naPeople.averageWeight();america nPeople.averageWeight();beiji ngPeople.averageWeight();chi naPeople.ch inaGon gfu();america nPeople.america nBox in g();beiji ngPeople.beiji ngOpera();beiji ngPeople.ch in

10、aGon gfu(); 实验2银行利息计算1. 实验要求假设银行Bank()已经有了按整年 year计算利息的一般方法，其中 year只能取正整数。比如按整 年计算的方法：double computerI nterest() in terest=year*0.35*savedM on ey;return in terest;建设银行ConstructionBank是Bank的子类，准备隐藏继承的成员变量year,并重写计算利息的方法，即自己声明一个 double型的year变量，比如，当year取值5.216时，表示要计算5年零216 天的利息，但希望首先按银行 Bank的方法computer

11、Interest()计算出5整年的利息，然后再计算216天的利息。那么，建设银行就必须把5.216的整数部分赋给隐藏的year,并让super调用隐藏的，按整年计算利息的方法。要求 ConstructionBank 和 BankOfDalian 类是 Bank 类的子类，ConstructionBank 和 BankOfDalian 都使用super调用隐藏的成员变量和方法。2. 程序模板Ban k.java public class Bank int savedM on ey;int year;double in terest;double in terestRate = 0.29; pub

12、lic double computerI nterest() in terest=year*i nterestRate*savedM on ey;return in terest;public void setI nterestRate(double rate) in terestRate = rate; Con structio nBan k.javapublic class Con struct ionBank exte nds Bank double year;public double computerI nterest() super.year=(i nt)year;double r

13、 = year-(i nt)year;int day=(i nt)(r*1OOO);double yearInterest =【代码 1】/super 调用隐藏的 computerInterest()double day In terest = day*0.0001*savedMo ney;in terest= yearI nterest+day In terest;System.out.printf(%d元存在建设银行d年零4天的利息：f元n,savedM on ey,super.year,day,i nterest);return in terest;Ban kOfDalia n.java

14、public class Ban kOfDalia n exte nds Bank double year;public double computerI nterest() super.year=(i nt)year;double r = year-(i nt)year;int day=(i nt)(r*1OOO);double yearInterest =【代码 2】/ super调用隐藏的 computerInterest()double dayI nterest = day*0.00012*savedMo ney;in terest= yearI nterest+day In tere

15、st;System.out.printf(%d元存在大连银行d年零4天的利息:%f元n,savedM on ey,super.year,day,i nterest);return in terest;方法方法SaveMon ey.javapublic class SaveMoney public static void main(String args) int amou nt=8000;Con structi onBank bank1 = new Con struct ionBan k();ban k1.savedM oney = amount;ba nk1.year = 8.236;ba

16、nk1.setI nterestRate(0.035);double in terest1 = ban puterl nterest();Ban kOfDalian bank2 = new Ban kOfDalia n();ban k2.savedM oney = amount;ba nk2.year = 8.236;ba nk2.setI nterestRate(0.035);double in terest2=ba puterl nterest();System.out.pri ntf(两个银行利息相差 %f 元n ”,i nterest2-i nterest1)

17、;3. 实验扩展参照建设银行或大连银行，再编写一个商业银行，让程序输出8000元存在商业银行8年零236天的利息实验3公司支出的总薪水1.实验要求有一个 abstract 类，类名为 Employee。Employee 的子类有 YearWorker、MonthWorker 和 WeekWorker。YearWorker对象按年领取薪水，MonthWorker按月领取薪水，WeekWorker按州领取薪水。Employee类有一个 abstract 方法： Public abstract earnings();子类必须重写父类的earnings()方法，给出各自领取报酬的具体公式。有一个 Co

18、mpany类，该类用 Employee对象数组作为成员，Employee对象数组的单元可以是YearWorker对象的向上转型对象、MonthWorker对象的向上转型对象或WeekWorker对象的向上转型对象。程序能输出 Compa ny对象一年需要支付的薪水总额。2 .程序模板Comapa nySalary.java abstract class Employee public abstract double earnin gs();class YearWorker exte nds Employee 【代码1】/重写earnings()方法class Mon thWorker exte

19、 nds Employee 【代码2】/重写earnings()方法class WeekWorker exte nds Employee 【代码3】/重写earnings()方法。class Compa ny Employee employee;double salaries=0;Compa ny (Employee employee) this.employee=employee;public double salariesPay() salaries=O;【代码4】/计算salaries 。retur n salaries; public class Compa ny Salary public static void main(String args) Employee employee=new Employee29; /公司有29名雇员for(i nt i=0;iemployee.le ngth;i+) /雇员简单地分成三类if(i%3=0)emplo