JAVA實(shí)驗(yàn)6答案

1、GDOU-B-11-112廣東海洋大學(xué)學(xué)生實(shí)驗(yàn)報(bào)告書(shū)（學(xué)生用表）實(shí)驗(yàn)名稱 實(shí)驗(yàn)六 Java的接口與實(shí)現(xiàn) 課程名稱JaVa程序設(shè)計(jì)與開(kāi)發(fā) 課程號(hào)16232204技術(shù)學(xué)院（系）學(xué)生姓名信息學(xué)院專業(yè)學(xué)號(hào)計(jì)算機(jī)科學(xué)與技術(shù)班級(jí)計(jì)科實(shí)驗(yàn)地點(diǎn)鐘海樓04019實(shí)驗(yàn)日期2015 年10月26日、實(shí)驗(yàn)?zāi)康模?）學(xué)習(xí)掌握J(rèn)ava中類怎樣實(shí)現(xiàn)接口、接口回調(diào)技術(shù);（2）學(xué)習(xí)掌握J(rèn)ava程序中面向接口的編程思想。二、實(shí)驗(yàn)任務(wù)完成實(shí)驗(yàn)六指導(dǎo)上實(shí)驗(yàn)1、實(shí)驗(yàn)2、實(shí)驗(yàn)3的實(shí)驗(yàn)任務(wù)三、實(shí)驗(yàn)儀器設(shè)備和材料安裝有J2SE開(kāi)發(fā)工具的PC機(jī)。四、實(shí)驗(yàn)內(nèi)容和步驟實(shí)驗(yàn)1代碼如下：Estimator.javain terface Compure

2、rAveragepublic double average(double x);class Gymn astics impleme nts CompurerAverage public double average(double x) int coun t=x .len gth;double aver=0,temp=0;for(int i=0;i<count;i+) for(i nt j=i;j<co un t;j+) if(xj<xi) temp=xj; xj=xi; xi=temp;for(i nt i=1;i<co un t-1;i+)aver=aver+xi;i

3、f(cou nt>2)aver=aver/(co un t-2);elseaver=0;retur n aver;class School impleme nts CompurerAveragepublic double average(double x)int coun t=x .len gth;double sum=0;for(int i=0;i<count;i+)sum+=xi;retur n sum/co unt;public class Estimatorpublic static void main( Stri ng args)double a=9.89,9.88,9.

4、99,9.12,9.69,9.76,8.97;double b=89,56,78,90,100,77,56,45,36,79,98;CompurerAverage computer;computer =new Gymn astics();double result=computer.average(a);System.out.pri ntf("% n");System.out.pri ntf("體操選手最后得分：%5.3fn",result);computer =new School();result=computer.average(b);System

5、.out.pri ntf("班級(jí)考試平均分?jǐn)?shù)：%-5.2fn",result);運(yùn)行結(jié)果：9. 66873. 09練習(xí)：JAVACEstimator.java:27:錯(cuò)誤：School不是抽象的,并且未覆蓋 CompurerAverage中的抽象方法 average(double)class School impleme nts CompurerAverageA1個(gè)錯(cuò)誤實(shí)驗(yàn)2代碼如下：CheckCarWeight.javain terface ComputerWeightpublic double computerWeight();class Televisi on imp

6、leme nts ComputerWeightpublic double computerWeight()return 10.0;class Computer impleme nts ComputerWeightpublic double computerWeight()return 8.0;class WashMach ine impleme nts ComputerWeightpublic double computerWeight()return 35.5;class TruckComputerWeight goods;double totalWeihts=0;Truck(Compute

7、rWeight goods)this.goods=goods;public void setGoods(ComputerWeight goods)this.goods=goods;public double getTotalWeigths()totalWeihts=0;for(int i=0;i<goods.length;i+)totalWeihts+=puterWeight();return totalWeihts;public class CheckCarWeightpublic static void main( Stri ng args)ComputerWei

8、ght goods=new ComputerWeight650; for(int i=0;i<goods.length;i+)if(i%3=0)goodsi=new Televisi on();if(i%3=1)goodsi=new Computer。；if(i%3=2)goodsi=new WashMachi ne();Truck truck=new Truck(goods);System.out.pri ntf("n貨車裝載的貨物重量：%-8.5f kgn",truck.getTotalWeigths();goods=new ComputerWeight68;fo

9、r(int i=0;i<goods.length;i+)if(i%2=0)goodsi=new Televisi on();elsegoodsi=new WashMachi ne();truck.setGoods(goods);System.out.pri ntf("貨車裝載的貨物重量：%-8.5f kgn",truck.getTotalWeigths();運(yùn)行結(jié)果：貨車裝載的貨物重量：11574- 00000 kg 貨車裝載的貨物重量：1547. 00000 kg 請(qǐng)按任意鍵繼續(xù)*練習(xí)：class Refrigerrator impleme nts Computer

10、Weight public double computerWeight()return 10.5;不需修改Truck類實(shí)驗(yàn)3代碼如下：CheckDogState.javain terface DogStatepublic void showState();class SoftlyState impleme nts DogStatepublic void showState()System.out.println(”聽(tīng)主人的命令");class MeetE nemyState impleme nts DogStatepublic void showState()System.out.p

11、rintln(”狂叫，并沖向去狠咬敵人");class MeetFrie ndState impleme nts DogStatepublic void showState()System.out.println(”晃動(dòng)尾巴，表示歡迎");class MeetA no therDog impleme nts DogStatepublic void showState() System.out.pri ntl n(" 嬉戲");class DogDogState state;public void show()state.showState();publi

12、c void setState(DogState s) state=s;public class CheckDogStatepublic static void main( Stri ng args)Dog yellowDog=new Dog();System.out.pri nt("狗在主人面前："); yellowDog.setState( new SoftlyStateO);yellowDog.show();System.out.pri nt("狗遇到敵人："); yellowDog.setState( new MeetE nemyState();

13、 yellowDog.show();System.out.pri nt("狗遇到朋友："); yellowDog.setState(new MeetFriendState(); yellowDog.show();System.out.pri nt("狗遇到同伴："); yellowDog.setState(new MeetAnotherDog(); yellowDog.show();運(yùn)行結(jié)果:狗在主人面前：聽(tīng)主人的命令狗遇到敵人：狂叫，并沖向去狠咬敵人狗遇到朋友：晃動(dòng)尾巴，表示歡迎 狗遇到同伴；嬉戲請(qǐng)按任意鍵繼續(xù)練習(xí)：CheckWaterState.ja

14、vain terface WaterStatepublic void showState();class ColdState impleme nts WaterState public void showState()System.out.pri ntl n("固態(tài)");class Ordin aryState impleme nts WaterState public void showState()System.out.pri ntl n("液態(tài)");class HotState impleme nts WaterState public void

15、showState()System.out.pri ntl n("氣態(tài)");class WaterWaterState state;public void show()state.showState();public void setState(WaterState s) state=s;public class CheckWaterStatepublic static void main( Stri ng args)Water water =new Water();System.out.print(" 低于 0° C:"); water.setState(new ColdState(); water.show();System.out.print(" 高于 0° C且低于 100° C:&