实验五 继承与接口.doc

实验五 继承与接口1. 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2. 实验内容1、参考实验指导书中P26-37页，完成下面实验：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、完成习题：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。public class qiuhe public static void main(String args) long sum=0; System.out.println(1!+3!+5!+7!+9!+10!=); for(int i =1; i=10 ; i+=2) sum = sum + method(i); /调用方法 System.out.println(sum); /使用递归方法 static long method(int index) if(index=1) return 1; else return index*method(index-1); public class qiuhe public static void main(String args) long sum=0; System.out.println(1!+3!+5!+7!+9!+10!=); for(int i =1; i=10 ; i+=2) sum = sum + method(i); /调用方法 System.out.println(sum); /使用递归方法 static long method(int index) if(index=1) return 1; else return index*method(index-1); 3. 实验步骤参考实验指导书中P26-37页的实验步骤。4. 评分标准1. A内容功能完善，编程风格好，人机接口界面好； 2. B内容功能完善，编程风格良好，人机接口界面良好；3. C完成必做内容；4. D能完成必做内容；5. 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109zhhRAR|ZIP）实验1 中国人与美国人模板代码 People.javapublic class People protected 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 Peoplepublic void speakHello()System.out.println(你好);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 chinaGongfu()System.out.println(坐如钟,站如松,睡如弓);AmericanPeople.javapublic class AmericanPeople extends 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:176cmpublic void averageWeight()weight=75;System.out.println(Americans average weight:+weight+kg);public void americanBoxing()System.out.println(直拳、钩拳、组合拳);BeijingPeople.javapublic class BeijingPeople extends ChinaPeople/【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 beijingOpera()System.out.println(花脸、青衣、花旦和老生);Example.javapublic class Example public static void main(String args) ChinaPeople chinaPeople = new ChinaPeople();AmericanPeople americanPeople = new AmericanPeople();BeijingPeople beijingPeople = new BeijingPeople();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 银行与利息模板代码 Bank.javapublic class Bank int 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;ConstructionBank.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=/【代码1】/super调用隐藏的computerInterest()方法double dayInterest=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);return interest;BankOfDalian.javapublic class BankOfDalian extends Bankdouble year;public double computerInterest()super.year=(int)year;double r=year-(int)year;int day=(int)(r*1000);double yearInterest=/【代码2】/super调用隐藏的computerInterest()方法double dayInterest=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 SaveMoney public 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=puterInterest();BankOfDalian bank2=new BankOfDalian();bank2.savedMoney=amount;bank2.year=8.236;bank2.setInterestRate(0.035);double interest2=puterInterest();System.out.printf(两个银行利息相差%f元n,interest2-interest1);实验3 面积之和模板代码 Geometry.javapublic abstract class Geometry public abstract double getArea();TotalArea.javapublic class TotalArea Geometry tuxing;double totalArea=0;public void setTuxing(Geometry t)tuxing=t;public double computerTatalArea()/【代码3】/用循环语句让tuxing的元素调用getArea方法，并将返回的值累加到totalAreareturn totalArea;Rect.javapublic class Rect extends Geometrydouble a,b;Rect(double a,double b)this.a=a;this.b=b;/【代码1】/重写getArea()方法Circle.javapublic class Circle extends Geometrydouble r;Circle(double r)this.r=r;/【代码2】/重写getArea()方法MainClass.javapublic class MainClass public static void main(String args) Geometry tuxing=new Geometry29;/有29个Geometry对象for(int i=0;ituxing.length;i+)/29个Geometry对象分成两类if(i%2=0)tuxingi=new Rect(16+i,68);else if(i%2=1)tuxingi=new Circle(10+i);TotalArea computer=new TotalArea();computer.setTuxing(tuxing);System.out.printf(各种图形的面积之和：n%f,puterTatalArea();实验4 歌手大赛模板代码 ComputerAverage.javapublic interface ComputerAverage public double average(double x);SongGame.javapublic class SongGame implements ComputerAveragepublic double average(double x)int count=x.length;double aver=0,temp=0;for(int i=0;icount;i+)for(int j=0;jcount;j+)if(xjxi)temp=xj;xj=xi;xi=temp;for(int i=0;i2)aver=aver/(count-2);elseaver=0;return aver;School.javapublic class School implements ComputerAverage/【代码1】/重写public double average(double x)方法，返回数组x的元素的算术平方Estimator.javapublic class Estimator public static void main(String args) double a=;double b=;ComputerAverage computer;computer=new SongGame();double result=/【代码2】/computer调用average(x)方法，将数组a传递给参数xSystem.out.printf(%n);System.out.printf(歌手最后得分：%5.3fn,result);computer=new School();result=/【代码3】/computer调用average(x)方法，将数组b传递给参数xSystem.out.printf(学生平均体重：%-5.2f kg,result);实验5 天气预报模板代码 WeatherState.javapublic interface WeatherState public void showState();Weather.javapublic class Weather WeatherState state;public void show()state.showState();public void setState(WeatherState s)state=s;CloudyLittleState.javapublic class CloudyLittleState implements WeatherStatepublic void showState()System.out.print(少云，有时晴。);CloudyDayState.javapublic class CloudyDayState implements WeatherState/【代码1】/重写public void showState()方法HeavyRainState.javapublic class HeavyR