JAVA试验6答案

1、GDOU-B-11-112广东海洋大学学生实验报告书(学生用表)Java程序设计与开发实验名称 实验六.Java的接口与实现 课程名称 课程号16232204技术班级计算机科学与技术计科信息学院学院(系)专业 1 I2015年钟海楼 实验日期实验地点 学号 学生姓名1004019月26日一、实验目的Java中类怎样实现接口、接口回调技术；(1)学习掌握 程序中面向接口的编程思想。2)学习掌握Java (二、实验任务的实验任务。2、实验3完成实验六指导上实验1、实验三、实验仪器设备和材料机。开发工具的PC安装有J2SE四、实验内容和步骤1实验代码如下：Estimator.javainterfac

2、e CompurerAveragepublic 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&g

3、t;2)aver=aver/(count-2);elseaver=0;return aver;class School implements CompurerAveragepublic double average(double口 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口 args)double a=9.89,9.88,9.99,9.12,9.69,9.76,8

4、.97;double 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);祓嗟泡St?3s霖械碟？体操选手最后得分：%5.3fn,result);computer=new School();result=computer.average(b);祓嗟泡滤毯添械碟？班级考试平均分数：%-5.2fn,result);运行结果：依模讥手工告得介：9.663 博缴考试即均分数

5、，73.09 诂祐仟克灌素续.练习:JAVAC中的抽CompurerAverage不是抽象的，并且未覆盖Estimator.java:27: 错误:Schoolaverage(double)象方法 class School implements CompurerAverageA个错误 12实验 代码如下： CheckCarWeight.javainterface ComputerWeightpublic double computerWeight();class Television implements ComputerWeightpublic double computerWeight()

6、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 setGoods(Comp

7、uterWeight 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口 args)ComputerWeight口 goods=new ComputerWeight650;for(int i=0;i<goods.

8、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(货车装载的货物重量：-8.5f kgn,truck.getTotalWeigths();goods=new ComputerWeight68;for(int i=0;i<goods.length;i+)if(i%2=0)goodsi=new Television。；elsegoodsi=

9、new WashMachine();truck.setGoods(goods);祓嗟泡滤毯添械碟？货车装载的货物重量：-8.5f kgn, truck.getTotalWeigths();运行结果：，干装载的优物声量;11574 DOOOO kg 空车装载的货物重量：154LOQOOO kB ，按任意键继续.练习：class Refrigerrator implements ComputerWeight public double computerWeight()return 10.5;不需修改Truck类3实验代码如下：CheckDogState.javainterface DogState

10、public void showState();class SoftlyState implements DogStatepublic void showState();听主人的命令 祓嗟泡滤毯添械埋魏龙class MeetEnemyState implements DogStatepublic void showState();祓嗟泡滤毯添械碟魏龙 狂叫，并冲向去狠咬敌人class MeetFriendState implements DogStatepublic void showState();祓嗟泡滤毯添械碟祭龙晃动尾巴，表示欢迎class MeetAnotherDog impleme

11、nts DogStatepublic void showState();嬉戏祓嗟泡滤毯添械碟魏龙class DogDogState state;public void show()state.showState();public void setState(DogState s)state=s;public class CheckDogStatepublic static void main(String口 args)Dog yellowDog=new Dog(););狗在主人面前：祓嗟泡源?3s霖械碟龙yellowDog.setState(newSoftlyState();yellowDog

12、.show();祓嗟泡滤毯添械埋龙狗遇到敌人：);yellowDog.setState(new MeetEnemyState(); yellowDog.show();祓嗟泡滤毯添械碟龙狗遇到朋友：);yellowDog.setState(new MeetFriendState();yellowDog.show();祓嗟泡滤毯添械碟龙狗遇到同伴：);yellowDog.setState(new MeetAnotherDog();yellowDog.show();运行结果:练习：CheckWaterState.javainterface WaterStatepublic void showStat

13、e();class ColdState implements WaterStatepublic void showState()祓嗟泡滤毯添械碟魏龙固态);class OrdinaryState implements WaterStatepublic void showState()祓嗟泡滤毯添械碟魏龙液态);class HotState implements WaterStatepublic void showState()祓嗟泡滤毯添械碟魏龙气态);class WaterWaterState state;public void show() state.showState();public void setState(WaterState s) state=s;public class CheckWaterStatepublic static void main(String口 args)Water water=new Water();祓嗟泡滤毯添械碟龙低于0° C:);water.setState(new ColdState();water.show();祓嗟泡滤毯添械碟龙高于0° C且低于100°