实验五-继承与接口

1、实验五继承与接口实验目的1、掌握类的继承细节内容，包括子类的继承、子类对象创建、成员变量的继承与隐藏、方法的继承与重写2、掌握重写的目的以及怎样使用super关键字3、掌握上转型对象与接口回调技术4、掌握类怎样实现接口，及面向接口的编程思想实验内容1、根据附录里的源代码，按照注释要求，完成代码填空，使程序能够运行得出结果。1）实验1中国人与美国人2）实验2银行与利息3）实验3面积之和4）实验4歌手大赛5）实验5天气预报2、设计编写程序完成以下任务。1）根据要求修改实验2，参照建设银行再编写一个商业银行（广发行），让程序输出8000元在广发行8年零212天的利息。2）根据要求修改实验3,再增加一

2、种几何图形（梯形），并让主类中的tuxing的某些元素是梯形的上转型对象。3）仿照实验5编写一个程序实现模拟水杯中的水在不同温度下可能出现的状态。4）编写一个接口并创建两个实现该接口的类A、B。A、B类实现了接口的f方法，A类的f方法内容为计算1!+3!+5!+9!并返回结果，B类的f方法内容为计算2!+4!+6!+10!也返回结果；再编一个执行类，执行类运行时要求通过接口回调方式用同一个对象实例分别调用A类的f方法和B类的f方法。5）（1）定义一个汽车类Vehicle，要求如下：（知识点：类的继承方法的覆盖）（a）属性包括：汽车品牌brand（String类型）、颜色color（String

3、类型）和速度speed（double类型）。（b）至少提供一个有参的构造方法（要求品牌和颜色可以初始化为任意值，但速度的初始值必须为0）。（c）为属性提供访问器方法。注意：汽车品牌一旦初始化之后不能修改。（d）定义一个一般方法run（），用打印语句描述汽车奔跑的功能。定义测试类VehicleTest，在其main方法中创建一个品牌为“benz”、颜色为“black”的汽车。（2）定义一个Vehicle类的子类轿车类Car，要求如下：（a）轿车有自己的属性载人数loader（int类型）。（b）提供该类初始化属性的构造方法。（c）重新定义run（），用打印语句描述轿车奔跑的功能。(d)定义测试类

4、Test,在其main方法中创建一个品牌为“Honda”、颜色为“red”，载人数为2人的轿车。面向对象基础出过类似的，这个把继承引入了6)Cola公司的雇员分为以下若干类：(知识点：多态)ColaEmployee：这是所有员工总的父类，属性：员工的姓名,员工的生日月份。方法：getSalary(intmonth)根据参数月份来确定工资，如果该月员工过生日，则公司会额外奖励100元。SalariedEmployee：ColaEmployee的子类，拿固定工资的员工。属性：月薪HourlyEmployee：ColaEmployee的子类，按小时拿工资的员工，每月工作超出160小时的部分按照1.5

5、倍工资发放。属性：每小时的工资、每月工作的小时数SalesEmployee：ColaEmployee的子类，销售人员，工资由月销售额和提成率决定。属性：月销售额、提成率(5)定义一个类Company，在该类中写一个方法，调用该方法可以打印出某月某个员工的工资数额，写一个测试类TestCompany,在main方法，把若干各种类型的员工放在一个ColaEmployee数组里，并单元出数组中每个员工当月的工资。知识点：继承与多态7)利用接口实现动态的创建对象：(知识点：接口)(1)创建4个类1苹果2香蕉3葡萄4园丁(2)在三种水果的构造方法中打印一句话.以苹果类为例classapplepublic

6、apple()System.out.println(“创建了一个苹果类的对象”);(3)类图如下：FruitPmrGardener+create():Fruit(4)要求从控制台输入一个字符串，根据字符串的值来判断创建三种水果中哪个类的对象。运行结果如图：FilsSd.itScEefaatarHavigate打3rdb电m=Jay-doc|lJeclaratimtestJivaApplicationC：IiHrtsr苹果另痛了一个幸果的对象.实验步骤实验一、1实验一、2Problems璘Javadoc良DechraftiomiSaveMoneyJavaApplicationE:MyEc吕的元看

7、在史金曼行吕正隼235五的*电24Z8.吕M仔仔0元的的五号在立逢汽行吕三笔235五的利奥二2%66,5600&x西馆行私也tl舒7,7触晅0元实验一、3实验一、4实验一、5实验二、1packageSFirst;publicclassBankintsavedMoney;intyear;doubleinterest;doubleinterestRate=0.29;publicdoublecomputerInterest()interest=year*interestRate*savedMoney;returninterest;publicvoidsetInterestRate(doublerat

8、e)interestRate=rate;)packageSFirst;publicclassGuangFaBankextendsBank(doubleyear;publicdoublecomputerlnterest()super.year=(int)year;doubler=year-(int)year;intday=(int)(r*1000);doubleyearInterest=puterInterest();/【代码1】/super调用隐藏的computerInterest()方法doubledayInterest=day*0.0001*savedMoney;interest=year

9、Interest+dayInterest;returninterest;packageSFirst;publicclassSaveMoneypublicstaticvoidmain(Stringargs)intamount=8000;GuangFaBankbank1=newGuangFaBank();bank1.savedMoney=amount;bank1.year=8.212;bank1.setInterestRate(0.035);doubleinterest1=puterInterest();System.out.println(8000元在广发行8年零212天的利息为:+intere

10、st1);实验结果弑Problems:苏Javadoc陶DeclarationcterminatedSaveMoney1JavaAppliestio记左广及H目容隼212王第尼电拈:248.8实验二、2packageSSecond;publicabstractclassGeometrypublicabstractdoublegetArea();)packageSSecond;publicclassMainClasspublicstaticvoidmain(Stringargs)Trapezoidtuxing=newTrapezoid(4.7,7.9,7);/有29个Geometry对象doub

11、les=tuxing.getArea();System.out.printf(梯形的面积为：s);)packageSSecond;publicclassTrapezoidextendsGeometry(doublea,b,h;Trapezoid(doublea,doubleb,doubleh)this.a=a;this.b=b;this.h=h;)/【代码2】/重写getArea()方法OverridepublicdoublegetArea()/TODOAuto-generatedmethodstubreturn(a+b)*h/2;)实验结果Problenns璘JavadocMainChss弊

12、马第面程出二44.1000实验二、3packageSThird;publicclassBoiledStateimplementsWaterStateOverridepublicvoidshowState()/TODOAuto-generatedmethodstubSystem.out.println(开水。);/【代码3】/重写publicvoidshowState()方法packageSThird;publicclassIceStateimplementsWaterStatepublicvoidshowState()System.out.print(结冰。);packageSThird;pu

13、blicclassLittleWarmStateimplementsWaterState/【代码1】/重写publicvoidshowState()方法OverridepublicvoidshowState()/TODOAuto-generatedmethodstubSystem.out.println(微凉。)；packageSThird;publicclassWarmStateimplementsWaterStateOverridepublicvoidshowState()/TODOAuto-generatedmethodstubSystem.out.println(温水。);/【代码2】

14、/重写publicvoidshowState()方法packageSThird;publicclassWaterWaterStatestate;publicvoidshow()state.showState();publicvoidsetState(WaterStates)state=s;)packageSThird;publicclassWaterForecastpublicstaticvoidmain(Stringargs)WaterwaterState=newWater。；System.out.print(n温度在90-100时水杯水的状态：);waterState.setState(n

15、ewBoiledState();waterState.show。；System.out.print(n温度在50-80时水杯水的状态：);waterState.setState(newWarmState();waterState.show。；System.out.print(n温度在30-50时水杯水的状态：);waterState.setState(newLittleWarmState();waterState.show。；System.out.print(n温度在0度下时水杯水的状态：”)；waterState.setState(newIceState();waterState.show。

16、；)packageSThird;publicinterfaceWaterStatepublicvoidshowState();)实验结果且FProblems*Javadoc电DeclarationterminatedWaterForecastJavaApplicationE:MyEcl蔡豆在9好-1随寸水杯的找在：开忒.之中及5。-吕64水樨水的根在：荒水.意宜空39-5团外水杯笊的壮耳,徵近.I施宜在有哎下才正朽水的就右：溶述，packageSForth;publicclassAimplementsobjectpublicintf(inta,intb)intsum=0,temp=1;for(

17、inti=a;i=b;i=i+2)for(intj=1;j=i;j+)temp*=j;sum+=temp;temp=1;returnsum;packageSForth;publicclassBimplementsobjectpublicintf(inta,intb)intsum=0,temp=1;for(inti=a;i=b;i=i+2)for(intj=1;jTest4JavaApplicationEEcliebinarycc1：H-3lH-5!.+9!的妈用=3680472l4-4：4-0!的洛原有：3669B6-6实验五packageSFifth;publicclassCarextend

18、sVehicleintloader;publicCar(Stringbrand,Stringcolor,doublespeed,intl)super(brand,color,speed);this.loader=l;/TODOAuto-generatedconstructorstubpublicvoidrun()System.out.println(颜色为+super.getColor()+的+super.getBrand()+汽车的时速为：+super.getSpeed();packageSFifth;publicclassTestpublicstaticvoidmain(Stringarg

19、s)/TODOAuto-generatedmethodstubCarc=newCar(Honda,red”,300.0,20);c.run();packageSFifth;publicclassVehicleprivateStringbrand=BMW;/汽车品牌privateStringcolor=red;/汽车颜色privatedoublespeed=0;/汽车时速publicStringgetColor()returncolor;publicvoidsetColor(Stringcolor)this.color=color;publicdoublegetSpeed()returnspee

20、d;publicvoidsetSpeed(doublespeed)this.speed=speed;publicStringgetBrand()returnbrand;publicVehicle(Stringbrand,Stringcolor,doublespeed)/TODOAuto-generatedconstructorstubthis.brand=brand;this.color=color;this.speed=speed;publicvoidrun()System.out.println(brand+汽车的时速为:+speed);packageSFifth;publicclassV

21、ehicleTestpublicstaticvoidmain(Stringargs)/TODOAuto-generatedmethodstubVehiclev=newVehicle(benz,black,200.0);v.run();)实验结果Problems濡Jg己dot篇DeH日VehicleTest1Javaben普工事的甘双灯二2&9.0实验六packageSSixth;publicclassColaEmployeeStringname;/员工姓名intmonth;/员工生日月份publicStringgetName()returnname;publicvoidsetName(Stri

22、ngname)=name;publicintgetMonth()returnmonth;publicvoidsetMonth(intmonth)this.month=month;intgetSalary(intmonth)if(month=this.month)return100;elsereturn0;packageSSixth;publicclassCompanyextendsColaEmployeevoidprint(Stringname,doublesalary,intmonth)StringName=name;doubleSalary=salary;intMonth=month;Sy

23、stem.out.println(员工+Name+在+Month+月+的薪资为：+Salary);packageSSixth;publicclassHourlyEmployeeextendsColaEmployeedoublehours;/每月工作的时间doublehsalary;/每小时的工资Companyc=newCompany();publicHourlyEmployee(Stringname,intmonth,doublehours,doublehsalary)/TODOAuto-generatedconstructorstubthis.hours=hours;this.hsalary

24、=hsalary;this.month=month;=name;publicdoublegetHours()returnhours;publicvoidsetHours(doublehours)this.hours=hours;publicdoublegetHsalary()returnhsalary;publicvoidsetHsalary(doublehsalary)this.hsalary=hsalary;publicintgetSalary(intmonth)if(this.hours=160)this.hsalary=this.hsalary*this.hours+super.get

25、Salary(month);c.print(name,hsalary,month);return0;elsethis.hsalary=(this.hours-160)*this.hsalary*1.5+160*this.hsalary+super.getSalary(month);c.print(name,hsalary,month);return0;packageSSixth;publicclassSalariedEmployeeextendsColaEmployeedoublesalary;/员工固定薪资(按月)Companyc=newCompany();publicSalariedEmp

26、loyee(Stringname,intmonth,doublesalary)/TODOAuto-generatedconstructorstub=name;this.month=month;this.salary=salary;publicintgetSalary(intmonth)this.salary=salary+super.getSalary(month);c.print(name,salary,month);return0;packageSSixth;publicclassSalesEmployeeextendsColaEmployeedoublemoney;/月销售额double

27、ticheng;/提成率Companyc=newCompany();publicSalesEmployee(Stringname,intmonth,doublemoney,doubleticheng)/TODOAuto-generatedconstructorstubthis.money=money;this.month=month;=name;this.ticheng=ticheng;publicdoublegetMoney()returnmoney;publicvoidsetMoney(doublemoney)this.money=money;publicdoublegetTicheng(

28、)returnticheng;publicvoidsetTicheng(doubleticheng)this.ticheng=ticheng;publicintgetSalary(intmonth)this.money=money+super.getSalary(month)+(money*ticheng);c.print(name,money,month);return0;packageSSixth;publicclassSalesEmployeeextendsColaEmployeedoublemoney;/月销售额doubleticheng;/提成率Companyc=newCompany

29、();publicSalesEmployee(Stringname,intmonth,doublemoney,doubleticheng)/TODOAuto-generatedconstructorstubthis.money=money;this.month=month;=name;this.ticheng=ticheng;publicdoublegetMoney()returnmoney;publicvoidsetMoney(doublemoney)this.money=money;publicdoublegetTicheng()returnticheng;)publicvoidsetTi

30、cheng(doubleticheng)this.ticheng=ticheng;)publicintgetSalary(intmonth)this.money=money+super.getSalary(month)+(money*ticheng);c.print(name,money,month);return0;)packageSSixth;publicclassTestcompanypublicstaticvoidmain(Stringargs)/TODOAuto-generatedmethodstubColaEmployeece=newColaEmployee3;ce0=newSal

31、ariedEmployee(aa”,9,3000.0);ce1=newHourlyEmployee(bb”,3,2000.0,180);ce2=newSalesEmployee(cc”,6,6000,0.3);ce0.getSalary(2);ce1.getSalary(2);ce2.getSalary(2);实验结果保FProblems琮；Javadoc%Oeclara4ion用Console箕TestCo-mpany(1JJavaApplicationE:MyEclip&ebinf其Hmm在2,月的#资方：3际.0其ztbg?同为#矍后;5256-0.0戾hcu在2.目利手至台;78d0.

32、0实验七packageSSeventh;publicclassappleimplementsFruitpublicvoidapple()/TODOAuto-generatedmethodstubSystem.out.println(创建了一个苹果类的对象);Overridepublicvoidbanana()/TODOAuto-generatedmethodstubOverridepublicvoidpear()/TODOAuto-generatedmethodstubpackageSSeventh;publicclassbananaimplementsFruitpublicvoidbanan

33、a()/TODOAuto-generatedmethodstubSystem.out.println(BHHW-);Overridepublicvoidapple()/TODOAuto-generatedmethodstubOverridepublicvoidpear()/TODOAuto-generatedmethodstubpackageSSeventh;publicinterfaceFruitvoidapple();voidbanana();voidpear();packageSSeventh;publicclasspearimplementsFruitpublicvoidpear()/

34、TODOAuto-generatedmethodstubSystem.out.println(创建了一个梨子类的对象);Overridepublicvoidapple()/TODOAuto-generatedmethodstubOverridepublicvoidbanana()/TODOAuto-generatedmethodstubpackageSSeventh;importjava.util.Scanner;publicclassTestpublicstaticvoidmain(Stringargs)/TODOAuto-generatedmethodstub/Fruitf=newbana

35、na();Scannerinput=newScanner(System.in);System.out.println(请输入您要创建的类：”)；Stringattr=input.nextLine();if(attr.equals(banana)Fruitfruit=newbanana();fruit.banana();elseif(attr.equals(apple)Fruitfruit=newapple();fruit.apple();elseif(attr.equals(pear)Fruitfruit=newpear();fruit.pear();)elseSystemut.println

36、(输入有误！);)实验结果麻fProblems邙Javadoc时Determinateds-TestJavaApp濡鞋入宅要七春期荚：banana上建TT叁要走的走坛.评分标准A内容功能完善，编程风格好，人机接口界面好；B内容功能完善，编程风格良好，人机接口界面良好；C完成必做内容；D能完成必做内容；E未按时完成必做内容，或者抄袭（雷同者全部为E）.参照书上实验按模版要求，将【代码】替换为Java程序代码，编写好完整的程序文档，最后运行得到的相关文件，把实验所得文件一起打包上交。（压缩包的文件名为：学号后三位和名字开头字母，如109zhh.RAR|ZIP）模板代码附录：实验1中国人与美国人模板

37、代码People.javapublicclassPeopleprotecteddoubleweight,height;publicvoidspeakHello()System.out.println(yayayaya);publicvoidaverageHeight()height=173;System.out.println(averageheight:+height);publicvoidaverageWeight()weight=70;System.out.println(averageweight:+weight);ChinaPeople.javapublicclassChinaPeo

38、pleextendsPeoplepublicvoidspeakHello()System.out.println(你好)；publicvoidaverageHeight()height=168.78;System.out.println(中国人的平均身高:+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)；AmericanPeople.javapublicclassAmericanPeopleextendsPe

39、ople/【代码2】重写publicvoidspeakHello()方法,输出:Howdoyoudo/【代码3】/重写publicvoidaverageHeight()方法,输出:Americansaverageheight:176cmpublicvoidaverageWeight()weight=75;System.out.println(Americansaverageweight:+weight+kg);publicvoidamericanBoxing()System.out.println(直拳、钩拳、组合拳)；BeijingPeople.javapublicclassBeijingP

40、eopleextendsChinaPeople/【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)；Example.javapublicclassExamplepublicstaticvoidmain(Stringargs)ChinaPeoplechinaPeople=newChinaPeople();AmericanPeop

41、leamericanPeople=newAmericanPeople();BeijingPeoplebeijingPeople=newBeijingPeople();chinaPeople.speakHello();americanPeople.speakHello();beijingPeople.speakHello();chinaPeople.averageHeight();americanPeople.averageHeight();beijingPeople.averageHeight();chinaPeople.averageWeight();americanPeople.avera

42、geWeight();beijingPeople.averageWeight();chinaPeople.chinaGongfu();americanPeople.americanBoxing();beijingPeople.beijingOpera();beijingPeople.chinaGongfu();实验2银行与利息Bank.javapublicclassBankintsavedMoney;intyear;doubleinterest;doubleinterestRate=0.29;publicdoublecomputerInterest()interest=year*interes

43、tRate*savedMoney;returninterest;publicvoidsetInterestRate(doublerate)interestRate=rate;ConstructionBank.javapublicclassConstructionBankextendsBankdoubleyear;publicdoublecomputerInterest()super.year=(int)year;doubler=year-(int)year;intday=(int)(r*1000);doubleyearInterest=/【代码1】/super调用隐藏的computerInte

44、rest()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;BankOfDalian.javapublicclassBankOfDalianextendsBankdoubleyear;publicdoublecomputerInterest()super.year=(int)year;doubler=year

45、-(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;SaveMoney.javapublicclassSaveMoneypublicsta

46、ticvoidmain(Stringargs)intamount=8000;ConstructionBankbank1=newConstructionBank();bank1.savedMoney=amount;bank1.year=8.236;bank1.setInterestRate(0.035);doubleinterest1=puterInterest();BankOfDalianbank2=newBankOfDalian();bank2.savedMoney=amount;bank2.year=8.236;bank2.setInterestRate(0.035);doubleinte

47、rest2=puterInterest();System.out.printf(两个银行利息相差元也”,血010512-血010511);实验3面积之和模板代码Geometry.javapublicabstractclassGeometrypublicabstractdoublegetArea();TotalArea.javapublicclassTotalAreaGeometrytuxing;doubletotalArea=0;publicvoidsetTuxing(Geometryt)tuxing=t;publicdoublecomputerTatalArea()/【代码3】用循环语句让t

48、uxing的元素调用getArea方法，并将返回的值累加到totalAreareturntotalArea;模板代码模板代码Rect.javapublicclassRectextendsGeometrydoublea,b;Rect(doublea,doubleb)this.a=a;this.b=b;/【代码1】重写getArea()方法Circle.javapublicclassCircleextendsGeometrydoubler;Circle(doubler)this.r=r;/【代码2】重写getArea()方法MainClass.javapublicclassMainClasspub

49、licstaticvoidmain(Stringargs)Geometry口tuxing=newGeometry29;/W29个Geometry对象for(inti=0;ituxing.length;i+)29个Geometry对象分成两类if(i%2=0)tuxingi=newRect(16+i,68);elseif(i%2=1)tuxingi=newCircle(10+i);TotalAreacomputer=newTotalArea();computer.setTuxing(tuxing);System.out.printf(各种图形的面积之和：n%f,puterTatalArea();

50、实验4歌手大赛ComputerAverage.javapublicinterfaceComputerAveragepublicdoubleaverage(doublex);SongGame.javapublicclassSongGameimplementsComputerAveragepublicdoubleaverage(doublex)intcount=x.length;doubleaver=0,temp=0;for(inti=0;icount;i+)for(intj=0;jcount;j+)if(xjxi)temp=xj;xj=xi;xi=temp;for(inti=0;i2)aver=aver/(co