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1、第八次实验实验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，北京人是中国人。除主类外，程序中还有4个类：People、ChinaPeople、AmericanPeople和BeijingPeople 类。要求如下：（1） People类有权限是protected的double型成员变量height和weight，以及public void speakHello、public void averageHeight和public void averageWeight方法。（2） ChinaPeople类是People的子类，新增了public void averageHe
2、ight和public voidaverageWeight方法。（3） AmericanPeople类是People的子类，新增方法public void AmericanBoxing 。要求AmericanPeople重写父类的public void speakHello、public void averageHeight和public void averageWeight方法。（4） BeijingPeople类是ChinaPeople的子类，新增public void beijingOpera方法。2.实验代码：/People.javapublic class People protec
3、ted double weight,height;public void speakHello() System.out.println(yayayaya);public void averageHeight() height=173;System.out.println(average height:+height);public void averageWeight() weight=70;System.out.println(average weight:+weight);/ChinaPeople.javapublic class ChinaPeople extends People p
4、ublic void speakHello() (您好);public void averageHeight() height=168.78;System.out.println(中国人的平均身高：+height+厘米);public void averageWeight() weight=65;System.out.println(中国人的平均体重：+weight+千克);public void chinaGongfu() System.out.println(坐如钟，站如松，睡如弓);/AmericanPeople.javapublic class AmericanPeople exten
5、ds People public void speakHello () System.out.println(How do you do);public void averageHeight() height=176;System.out.println(Americans average height:+height+厘米);public void averageWeight() weight=75;System.out.println(Americans average weight:+weight+ kg);public void americanBoxing() System.out.
6、println(直拳，勾拳，组合拳);/BeijingPeople.javapublic class BeijingPeople extends ChinaPeople public void averageHeight() height=172.5;System.out.println(北京人的平均身高:+height+厘米);public void averageWeight() weight=70;System.out.println(北京人得平均体重：+weight+千克);public void beijingOpera() System.out.println(花脸、青衣、花旦和老
7、生);/Example.javapublic class Example public static void main(String arg) ChinaPeople chinaPeople=new ChinaPeople();AmericanPeople americanPeople=new AmericanPeople();BeijingPeople beijingPeople=new BeijingPeople();chinaPeople.speakHello();americanPeople.speakHello();beijingPeople.speakHello();chinaP
8、eople.averageHeight();americanPeople.averageHeight();beijingPeople.averageHeight();chinaPeople.averageWeight();americanPeople.averageWeight();beijingPeople.averageWeight();chinaPeople.chinaGongfu();americanPeople.americanBoxing();beijingPeople.beijingOpera();beijingPeople.chinaGongfu();3.实验结果：4.实验分析
9、：(1) 方法重写时要保证方法的名字、类型、参数的个数和类型同父类的某个方法完全想同。这样，子类继承的方法才能被隐藏。(2) 子类在重写方法时，如果重写的方法是static方法，static关键字必须保存；如果重写的方法是实例方法，重写时不可以用static修饰。(3) 如果子类可以继承父类的方法，子类就有权利重写这个方法，子类通过重写父类的方法可以改变父类的具遗体行为。5.实验后的练习：People类中的public void speakHello() public void averageHeight() public void averageWeight() 三个方法的方法体中的语句是否
10、可以省略。答：可以省略，因为省略后结果没有变化 实验2：银行计算利息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。比方，按整年计算的方法：Double computerInternet()Interest=year*0.35*saveMoney;Return interest;建设银行constructionBank是bankde 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。要求constructionbank和bankofDalian类是bank类的子类，constructionb
11、ank和bankofdalian都使用super调用隐藏的按整年计算利息的方法。2.实验代码：/Bank.javapublic class Bankint savedMoney;int year;double interest;double interestRate=0.29;public double computerInterest()interest=year*interestRate*savedMoney;return interest;public void setInterestRate( double rate)interestRate=rate;/ ConstructionBa
12、nk.javapublic class ConstructionBank extends Bankdouble year;public double computerInterest()super.year=(int)year;double r=year-(int)year;int day=(int)(r*1000);double yearInterest=super puterInterest();double dayInterest=day*0.0001*savedMoney;interest=yearInterest+dayInterest;System.out.printf(%d元存在
13、建设银行%d年零%d天的利息:%f元n,savedMoney,super.year,day,interest);return interest;/ BankOfDalian.javapublic class BankOfDalian extends Bank double year; public double computerInterest() super.year=(int)year; double r=year-(int)year; int day=(int)(r*1000); double yearInterest=super puterInterest(); double dayI
14、nterest=day*0.00012*savedMoney; interest=yearInterest+dayInterest; System.out.printf(%d元存在大连银行%d年零%d天的利息:%f元n,savedMoney,super.year,day,interest); return interest; / SaveMoney.javapublic class SaveMoneypublic static void main(String args)int amount=8000;ConstructionBank bank1=new ConstructionBank();bank1.savedMoney=amount;bank1.year=8.236;bank1.setInterestRate(0.035);double interest1=bank1 puterInter
