JAVA实验6答案教学教材

1、 6实J案答验AVAGDOU-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1 6232204 技术 班级计算机科学与技术 计科) 学院(系信息学院 专业 2015年 钟海楼2610月 学生姓名 学号实验日期实验地点04019 日 一、实验目的 中类怎样实现接口、接口回调技术；Java（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。、实验3、实验 完成实验六指导上实验12 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

2、代码如下：Estimator.java interface CompurerAverage public double average(double x); class Gymnastics implements CompurerAverage public double average(double x) int count=x.length; double aver=0,temp=0; for(int i=0;icount;i+) for(int j=i;jcount;j+) if(xjxi) temp=xj; xj=xi; xi=temp; for(int i=1;i2) aver=av

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

4、 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); 祓瑳浥漮瑵瀮楲瑮?体操选手最后得分：%5.3fn,result); computer=new School(); result=computer.average(b); 祓瑳浥漮瑵瀮楲瑮?班级考试平均分数：%-5.2fn,result); 运行结果： 练习：- JAVAC - 中的抽Co

5、mpurerAverage不是抽象的, 并且未覆盖Estimator.java:27: 错误: Schoolaverage(double) 象方法class School implements CompurerAverage 个错误1 2 实验 代码如下：CheckCarWeight.java interface ComputerWeight public double computerWeight(); class Television implements ComputerWeight public double computerWeight() return 10.0; class Co

6、mputer implements ComputerWeight public double computerWeight() return 8.0; class WashMachine implements ComputerWeight public double computerWeight() return 35.5; class Truck ComputerWeight goods; double totalWeihts=0; Truck(ComputerWeight goods) this.goods=goods; public void setGoods(ComputerWeigh

7、t goods) this.goods=goods; public double getTotalWeigths() totalWeihts=0; for(int i=0;igoods.length;i+) totalWeihts+=puterWeight(); return totalWeihts; public class CheckCarWeight public static void main(String args) ComputerWeight goods=new ComputerWeight650; for(int i=0;igoods.length;i+)

8、 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;igoods.length;i+) if(i%2=0) goodsi=new Television(); else go

9、odsi=new WashMachine(); truck.setGoods(goods); 祓瑳浥漮瑵瀮楲瑮?货车装载的货物重量：%-8.5f kgn, truck.getTotalWeigths(); 运行结果： 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.java interface DogState public void showState(); class SoftlyS

10、tate implements DogState public void showState() ); 听主人的命令 祓瑳浥漮瑵瀮楲瑮湬尨 class MeetEnemyState implements DogState public void showState() ); 祓瑳浥漮瑵瀮楲瑮湬尨狂叫，并冲向去狠咬敌人 class MeetFriendState implements DogState public void showState() ); 祓瑳浥漮瑵瀮楲瑮湬尨晃动尾巴，表示欢迎 class MeetAnotherDog implements DogState public voi

11、d showState() ); 嬉戏 祓瑳浥漮瑵瀮楲瑮湬尨 class Dog DogState state; public void show() state.showState(); public void setState(DogState s) state=s; public class CheckDogState public static void main(String args) Dog yellowDog=new Dog(); ); 祓瑳浥漮瑵瀮楲瑮尨狗在主人面前： yellowDog.setState(new SoftlyState(); yellowDog.show()

12、; 祓瑳浥漮瑵瀮楲瑮尨狗遇到敌人： ); yellowDog.setState(new MeetEnemyState(); yellowDog.show(); 祓瑳浥漮瑵瀮楲瑮尨 狗遇到朋友：); yellowDog.setState(new MeetFriendState(); yellowDog.show(); 祓瑳浥漮瑵瀮楲瑮尨狗遇到同伴： ); yellowDog.setState(new MeetAnotherDog(); yellowDog.show(); 运行结果： 练习： CheckWaterState.java interface WaterState public void

13、 showState(); class ColdState implements WaterState public void showState() 祓瑳浥漮瑵瀮楲瑮湬尨固态); class OrdinaryState implements WaterState public void showState() 祓瑳浥漮瑵瀮楲瑮湬尨液态); class HotState implements WaterState public void showState() 祓瑳浥漮瑵瀮楲瑮湬尨气态); class Water WaterState state; public void show() state.showState(); public void setState(WaterState s) state=s; public class CheckWaterState public static void main(String args) Water water=new Water(); 祓瑳浥漮瑵瀮楲瑮尨低于0C：); water.setState(new