Java程序设计-试验3(学生版)

..实用文档.实用文档.华北电力大学实验报告实验名称 Java程序面向对象设计〔二〕课程名称 Java程序设计专业班级学 号：

学生姓名成 绩：指导教师：张学斌 实验日期：一、实验目的及要求掌握类的继承。掌握类的隐藏和覆盖。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ChinaPeoplAmericanPeopl和BeijingPeope要求如下：People类有权限是protecte的double型成员变量height和weightcspeakHellopublicvoidaverageHeihblicvoidaverageWeihChinaPeopl类是PeoplpublicvoidchinaGonguChinapeople重写父类的publicvoidspeakHelicvoidaverageHeihblicvoidaverageWeight()方法。AmericanPeople类是People的子类，新增publicvoidamericanBoxing(方)法。要求Americanpeopl重写父类的publicvoidspeakHelicvoidaverageHeihblicvoidaverageWeight法。BeijingPeope是ChinapeoplpublicvoidbeijingOprChinaPeople重写父类的publicvoidspeakHelicvoidaverageHeihblicvoidaverageWeight()方法。程序模板publicclassPeople{protecteddoubleweight,height;publicvoidspeakHello(){System.out.println("yayayaya");}publicvoidaverageHeight(){height=173;System.out.println("averageheight:"+height);}publicvoidaverageWeight(){weight=70;System.out.println("averageweight:"+weight);}}publicclassChinaPeopleextendsPeoplepublicvoidspeakHello(){System.out.printn}publicvoidaverageHeight(){height=168.78;System.out.println(":"+height+"厘米");}【代码1】//重写publicvoidaverageWeight()方法，输出:"中国人的平均体重：65公斤"publicvoidchinaGongfu(){System.out.println("坐如钟,站如松,睡如弓");}}publicclassAmericanPeopleextendsPeople{【代码2】//重写publicvoidspeakHello()方法，输出"Howdoyoudo"【代码3】//重写publicvoidaverageHeight()方法，输出"American'saverageheight:176cm"publicvoidaverageWeight(){weight=75;System.out.println("American'saverageweight:"+weight+"kg");}publicvoidamericanBoxing(){System.out.println("直拳、钩拳、组合拳");}}publicclassBeijingPeopleextendsChinaPeople{【代码4】//重写publicvoidaverageHeight()方法,输出:"北京人的平均身高:172.5厘米"【代码5】//重写publicvoidaverageWeight()方法,输出:"北京人的平均体重：70公斤"publicvoidbeijingOpera(){System.out.println("花脸、青衣、花旦和老生");}}publicclassExample{publicstaticvoidmain(Stringargs[]){ChinaPeoplechinaPeople=newChinaPeople();AmericanPeopleamericanPeople=newAmericanPeople();BeijingPeoplebeijingPeople=newBeijingPeople();chinaPeople.speakHello();americanPeople.speakHello();beijingPeople.speakHello();chinaPeople.averageHeight();americanPeople.averageHeight();beijingPeople.averageHeight();chinaPeople.averageWeight();americanPeople.averageWeight();beijingPeople.averageWeight();chinaPeople.chinaGongfu();americanPeople.americanBoxing();beijingPeople.beijingOpera();beijingPeople.chinaGongfu();}}实验2银行利息计算实验要求假设银行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：doublecomputerInterest(){interest=year**savedMoney;returninterest;}ConstructionBank是Bank法，即自己声明一个doubleyear变量，比方，当year5.2165216天的利息，但希望首先按银行BankcomputerInterest()5216天5.216的整数局部赋给隐藏的year，并让super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。程序模板publicclassBank{intsavedMoney;intyear;doubleinterest;doubleinterestRate=0.29;publicdoublecomputerInterest(){interest=year*interestRate*savedMoney;returninterest;}publicvoidsetInterestRate(doublerate){interestRate=rate;}}publicclassConstructionBankextendsBank{doubleyear;publicdoublecomputerInterest()super.year=(int)year;doubler=year-(int)year;intday=(int)(r*1000);doubleyearInterest=【代码1】//super调用隐藏的computerInterest()方法doubledayInterest=day*0.0001*savedMoney;interest=yearInterest+dayInterest;System.out.printf("%d元存在建设银行%d年零%d天的利息:%f元\n",savedMoney,super.year,day,interest);returninterest;}}publicclassBankOfDalianextendsBank{doubleyear;publicdoublecomputerInterest()super.year=(int)year;doubler=year-(int)year;intday=(int)(r*1000);doubleyearInterest=【代码2】//super调用隐藏的computerInterest()方法doubledayInterest=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);returninterest;}}publicclassSaveMoney{publicstaticvoidmain(Stringargs[]){intamount=8000;ConstructionBankbank1=newConstructionBank();bank1.savedMoney=amount;bank1.year=8.236;bank1.setInterestRate(0.035);doubleinterest1=bank1 puterInterest();BankOfDalianbank2=newBankOfDalian();bank2.savedMoney=amount;bank2.year=8.236;bank2.setInterestRate(0.035);doubleinterest2=bank2 puterInterest();System.out.printf("两个银行利息相差%f元\n",interest2-interest1);}}实验扩展80008236天的利息实验3 公司支出的总薪水实验要求有一个abstractEmployeeEmployee的子类有MonthWorker和YearWorker对象按年领取薪水，MonthWorker按月领取薪水，WeekWorkerEmployee类有一个abstract方法：Publicabstractearnings();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Company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Company对象一年需要支付的薪水总额。程序模板abstractclassEmployee{publicabstractdoubleearnings();}classYearWorkerextendsEmployee{1】//重写earnings()方法}classMonthWorkerextendsEmployee{【代码2】//重写earnings()方法}classWeekWorkerextendsEmployee{【代码3】//重写earnings()方法。}classCompany{Employee[]employee;doublesalaries=0;Company(Employee[]employee){this.employee=employee;}publicdoublesalariesPay(){salaries=0;【代码4】//计算salaries。returnsalaries;}}publicclassCompanySalary{publicstaticvoidmain(Stringargs[]){Employee[]employee=newEmployee[29];公司有29名雇for(inti=0;i<employee.length;i++){ //雇员简单地分成三类if(i%3==0)employee[i]=newelseif(i%3==1)employee[i]=newMonthWorker();elseif(i%3==2)employee[i]=newYearWorker();}Companycompany=newCompany(employee);元}}实验指导对于【代码2】，一年按12个月计算出雇员的一年的年薪，比方：publicdoubleearnings(){return12*2300;}尽管