JAVA實(shí)驗(yàn)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（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)與開發(fā)技術(shù)課程號(hào)16232204學(xué)院(系)信息學(xué)院專業(yè)計(jì)算機(jī)科學(xué)與技術(shù)班級(jí)計(jì)科學(xué)生姓名學(xué)號(hào)實(shí)驗(yàn)地點(diǎn)鐘海樓04019實(shí)驗(yàn)日期2015年10月26日一、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.javainterface Compure

2、rAveragepublic double average(double x);class Gymnastics implements CompurerAveragepublic double average(double x)int count=x.length;double aver=0,temp=0;for(int i=0;i<count;i+)for(int j=i;j<count;j+)if(xj<xi)temp=xj;xj=xi;xi=temp;for(int i=1;i<count-1;i+)aver=aver+xi;if(count>2)aver=

3、aver/(count-2);else aver=0;return aver;class School implements CompurerAveragepublic double average(double x)int count=x.length;double sum=0;for(int i=0;i<count;i+)sum+=xi;return sum/count;public class Estimatorpublic static void main(String args)double a=9.89,9.88,9.99,9.12,9.69,9.76,8.97;double

4、 b=89,56,78,90,100,77,56,45,36,79,98;CompurerAverage computer;computer=new Gymnastics();double result=computer.average(a);System.out.printf("%n");System.out.printf("體操選手最后得分：%5.3fn",result);computer=new School();result=computer.average(b);System.out.printf("班級(jí)考試平均分?jǐn)?shù)：%-5.2fn&

5、quot;,result);運(yùn)行結(jié)果：練習(xí)：- JAVAC -Estimator.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 implements CompurerAverage1 個(gè)錯(cuò)誤實(shí)驗(yàn)2代碼如下：CheckCarWeight.javainterface ComputerWeightpublic double computerWeight();class Television implements ComputerWeightpublic double computerWe

6、ight()return 10.0;class Computer implements ComputerWeightpublic double computerWeight()return 8.0;class WashMachine implements ComputerWeightpublic double computerWeight()return 35.5;class TruckComputerWeight goods;double totalWeihts=0;Truck(ComputerWeight goods)this.goods=goods;public void setGood

7、s(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(String args)ComputerWeight goods=new ComputerWeight650;for(int i=0;i<goo

8、ds.length;i+)if(i%3=0)goodsi=new Television();if(i%3=1)goodsi=new Computer();if(i%3=2)goodsi=new WashMachine();Truck truck=new Truck(goods);System.out.printf("n貨車裝載的貨物重量：%-8.5f kgn",truck.getTotalWeigths();goods=new ComputerWeight68;for(int i=0;i<goods.length;i+)if(i%2=0)goodsi=new Tele

9、vision();elsegoodsi=new WashMachine();truck.setGoods(goods);System.out.printf("貨車裝載的貨物重量：%-8.5f kgn",truck.getTotalWeigths();運(yùn)行結(jié)果：練習(xí)：class Refrigerrator implements ComputerWeightpublic double computerWeight()return 10.5;不需修改Truck類實(shí)驗(yàn)3代碼如下：CheckDogState.javainterface DogStatepublic void show

10、State();class SoftlyState implements DogStatepublic void showState()System.out.println("聽主人的命令");class MeetEnemyState implements DogStatepublic void showState()System.out.println("狂叫，并沖向去狠咬敵人");class MeetFriendState implements DogStatepublic void showState()System.out.println(&qu

11、ot;晃動(dòng)尾巴，表示歡迎");class MeetAnotherDog implements DogStatepublic void showState()System.out.println("嬉戲");class DogDogState state;public void show()state.showState();public void setState(DogState s)state=s;public class CheckDogStatepublic static void main(String args)Dog yellowDog=new Do

12、g();System.out.print("狗在主人面前：");yellowDog.setState(new SoftlyState();yellowDog.show();System.out.print("狗遇到敵人：");yellowDog.setState(new MeetEnemyState();yellowDog.show();System.out.print("狗遇到朋友：");yellowDog.setState(new MeetFriendState();yellowDog.show();System.out.prin

13、t("狗遇到同伴：");yellowDog.setState(new MeetAnotherDog();yellowDog.show();運(yùn)行結(jié)果：練習(xí)：CheckWaterState.javainterface WaterStatepublic void showState();class ColdState implements WaterStatepublic void showState()System.out.println("固態(tài)");class OrdinaryState implements WaterStatepublic void s

14、howState()System.out.println("液態(tài)");class HotState implements WaterStatepublic void showState()System.out.println("氣態(tài)");class WaterWaterState state;public void show()state.showState();public void setState(WaterState s)state=s;public class CheckWaterStatepublic static void main(String args)Water water=new Water();System.out.print("低于0°C：");water.setState(new ColdState();water.show();Syste