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、根据附录里的源代码，按照注释要求，完成代码填空，使程序能够运行得出结果。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、设计编写程序完成以下任务。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。5）(1)定义一个汽车类Vehicle，要求如下：（知识点：类的继承 方法的覆盖）（a）属性包括：汽车品牌brand（String类型）、颜色color（String类型）和速度speed（double类型）。（b）至少提供一个有参的构造方法（要求品牌和颜色可以初始化为任意值，但速度的初始值必须为0）。（c）为属性提供访问器方法。注意：汽车品牌一旦初始化之后不能修改。（d）定义一个一般方法run()，用打印语句描述汽车奔跑的功能。定义测试类VehicleTest，在其main方法中创建一个品牌为“benz”、颜色为“black”的汽车。(2)定义一个Vehicle类的子类轿车类Car，要求如下：（a）轿车有自己的属性载人数loader（int 类型）。（b）提供该类初始化属性的构造方法。（c）重新定义run()，用打印语句描述轿车奔跑的功能。（d）定义测试类Test，在其main方法中创建一个品牌为“Honda”、颜色为“red”，载人数为2人的轿车。面向对象基础出过类似的，这个把继承引入了6）Cola公司的雇员分为以下若干类：(知识点：多态)(1) ColaEmployee ：这是所有员工总的父类，属性：员工的姓名,员工的生日月份。方法：getSalary(int month) 根据参数月份来确定工资，如果该月员工过生日，则公司会额外奖励100 元。(2) SalariedEmployee ：ColaEmployee 的子类，拿固定工资的员工。属性：月薪(3) HourlyEmployee ：ColaEmployee 的子类，按小时拿工资的员工，每月工作超出160 小时的部分按照1.5 倍工资发放。属性：每小时的工资、每月工作的小时数(4) SalesEmployee ：ColaEmployee 的子类，销售人员，工资由月销售额和提成率决定。属性：月销售额、提成率(5) 定义一个类Company，在该类中写一个方法，调用该方法可以打印出某月某个员工的工资数额，写一个测试类TestCompany,在main方法，把若干各种类型的员工放在一个ColaEmployee 数组里，并单元出数组中每个员工当月的工资。知识点：继承与多态7）利用接口实现动态的创建对象：（知识点：接口 ）（1）创建4个类1苹果2香蕉3葡萄4园丁（2）在三种水果的构造方法中打印一句话.以苹果类为例class applepublic apple()System.out.println(“创建了一个苹果类的对象”);（3）类图如下：（4）要求从控制台输入一个字符串，根据字符串的值来判断创建三种水果中哪个类的对象。运行结果如图：3. 实验步骤实验一、1实验一、2实验一、3实验一、4实验一、5实验二、1package SFirst;public 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;package SFirst;public class GuangFaBank extends Bankdouble year;public double computerInterest()super.year=(int)year;double r=year-(int)year;int day=(int)(r*1000);double yearInterest=puterInterest();/【代码1】/super调用隐藏的computerInterest()方法double dayInterest=day*0.0001*savedMoney;interest=yearInterest+dayInterest;return interest;package SFirst;public class SaveMoney public static void main(String args) int amount=8000;GuangFaBank bank1=new GuangFaBank();bank1.savedMoney=amount;bank1.year=8.212;bank1.setInterestRate(0.035);double interest1=puterInterest();System.out.println(8000元在广发行8年零212天的利息为：+interest1);实验结果实验二、2package SSecond;public abstract class Geometry public abstract double getArea();package SSecond;public class MainClass public static void main(String args) Trapezoid tuxing=new Trapezoid(4.7,7.9,7);/有29个Geometry对象double s=tuxing.getArea();System.out.printf(梯形的面积为：n%f,s);package SSecond;public class Trapezoid extends Geometrydouble a,b,h;Trapezoid(double a,double b,double h)this.a=a;this.b=b;this.h=h;/【代码2】/重写getArea()方法Overridepublic double getArea() / TODO Auto-generated method stubreturn (a+b)*h/2;实验结果实验二、3package SThird;public class BoiledState implements WaterStateOverridepublic void showState() / TODO Auto-generated method stubSystem.out.println(开水。);/【代码3】/重写public void showState()方法package SThird;public class IceState implements WaterStatepublic void showState()System.out.print(结冰。);package SThird;public class LittleWarmState implements WaterState/【代码1】/重写public void showState()方法Overridepublic void showState() / TODO Auto-generated method stubSystem.out.println(微凉。);package SThird;public class WarmState implements WaterStateOverridepublic void showState() / TODO Auto-generated method stubSystem.out.println(温水。);/【代码2】/重写public void showState()方法package SThird;public class Water WaterState state;public void show()state.showState();public void setState(WaterState s)state=s;package SThird;public class WaterForecast public static void main(String args) Water waterState=new Water();System.out.print(n温度在90-100时水杯水的状态：);waterState.setState(new BoiledState();waterState.show();System.out.print(n温度在50-80时水杯水的状态：);waterState.setState(new WarmState();waterState.show();System.out.print(n温度在30-50时水杯水的状态：);waterState.setState(new LittleWarmState();waterState.show();System.out.print(n温度在0度下时水杯水的状态：);waterState.setState(new IceState();waterState.show();package SThird;public interface WaterState public void showState();实验结果实验四package SForth;public class A implements object public int f(int a, int b) int sum=0,temp=1;for(int i=a;i=b;i=i+2)for(int j=1;j=i;j+)temp*=j;sum+=temp;temp=1;return sum;package SForth;public class B implements object public int f(int a, int b) int sum=0,temp=1;for(int i=a;i=b;i=i+2)for(int j=1;j=i;j+)temp*=j;sum+=temp;temp=1;return sum;package SForth;public interface object int f(int a,int b);package SForth;public class Test public static void main(String args) / TODO Auto-generated method stubA a=new A();B b=new B();int sum1=a.f(1, 9);int sum2=b.f(2, 10);System.out.println(1！+3！+5！+9！的结果为：+sum1);System.out.println(2！+4！+6！+10！的结果为：+sum2);实验结果实验五package SFifth;public class Car extends Vehicle int loader;public Car(String brand, String color, double speed,int l) super(brand, color, speed);this.loader=l;/ TODO Auto-generated constructor stubpublic void run()System.out.println(颜色为+super.getColor()+的+super.getBrand()+汽车的时速为：+super.getSpeed();package SFifth;public class Test public static void main(String args) / TODO Auto-generated method stubCar c=new Car(Honda,red,300.0,20);c.run();package SFifth;public class Vehicle private String brand=BMW;/汽车品牌private String color=red;/汽车颜色private double speed=0;/汽车时速public String getColor() return color;public void setColor(String color) this.color = color;public double getSpeed() return speed;public void setSpeed(double speed) this.speed = speed;public String getBrand() return brand;public Vehicle(String brand, String color, double speed) / TODO Auto-generated constructor stubthis.brand=brand;this.color=color;this.speed=speed;public void run() System.out.println(brand+汽车的时速为：+speed);package SFifth;public class VehicleTest public static void main(String args) / TODO Auto-generated method stubVehicle v=new Vehicle(benz,black,200.0);v.run();实验结果实验六package SSixth;public class ColaEmployee String name;/员工姓名int month;/员工生日月份public String getName() return name;public void setName(String name) = name;public int getMonth() return month;public void setMonth(int month) this.month = month;int getSalary(int month) if (month = this.month) return 100; else return 0; package SSixth;public class Company extends ColaEmployeevoid print(String name, double salary,int month)String Name=name;double Salary=salary;int Month=month;System.out.println(员工+Name+在+Month+月+的薪资为：+Salary);package SSixth;public class HourlyEmployee extends ColaEmployee double hours;/每月工作的时间double hsalary;/每小时的工资Company c=new Company();public HourlyEmployee(String name,int month, double hours, double hsalary) / TODO Auto-generated constructor stubthis.hours=hours;this.hsalary=hsalary;this.month=month;=name;public double getHours() return hours;public void setHours(double hours) this.hours = hours;public double getHsalary() return hsalary;public void setHsalary(double hsalary) this.hsalary = hsalary;public int getSalary(int month)if(this.hours=160)this.hsalary=this.hsalary*this.hours+super.getSalary(month);c.print(name,hsalary,month);return 0;else this.hsalary=(this.hours-160)*this.hsalary*1.5+160*this.hsalary+super.getSalary(month);c.print(name,hsalary,month);return 0;package SSixth;public class SalariedEmployee extends ColaEmployee double salary;/员工固定薪资（按月）Company c=new Company();public SalariedEmployee(String name, int month, double salary) / TODO Auto-generated constructor =name;this.month=month;this.salary=salary;public int getSalary(int month) this.salary=salary + super.getSalary(month); c.print(name,salary,month);return 0; package SSixth;public class SalesEmployee extends ColaEmployeedouble money;/月销售额double ticheng;/提成率Company c=new Company();public SalesEmployee(String name, int month, double money, double ticheng) / TODO Auto-generated constructor stubthis.money=money;this.month=month;=name;this.ticheng=ticheng;public double getMoney() return money;public void setMoney(double money) this.money = money;public double getTicheng() return ticheng;public void setTicheng(double ticheng) this.ticheng = ticheng;public int getSalary(int month) this.money= money + super.getSalary(month)+(money*ticheng); c.print(name,money,month); return 0; package SSixth;public class SalesEmployee extends ColaEmployeedouble money;/月销售额double ticheng;/提成率Company c=new Company();public SalesEmployee(String name, int month, double money, double ticheng) / TODO Auto-generated constructor stubthis.money=money;this.month=month;=name;this.ticheng=ticheng;public double getMoney() return money;public void setMoney(double money) this.money = money;public double getTicheng() return ticheng;public void setTicheng(double ticheng) this.ticheng = ticheng;public int getSalary(int month) this.money= money + super.getSalary(month)+(money*ticheng); c.print(name,money,month); return 0; package SSixth;public class TestCompany public static void main(String args) / TODO Auto-generated method stubColaEmployee ce =new ColaEmployee3;ce0=new SalariedEmployee(aa,9,3000.0);ce1=new HourlyEmployee(bb,3,2000.0,180);ce2=new SalesEmployee(cc,6,6000,0.3);ce0.getSalary(2);ce1.getSalary(2);ce2.getSalary(2);实验结果实验七package SSeventh;public class apple implements Fruit public void apple() / TODO Auto-generated method stubSystem.out.println(创建了一个苹果类的对象);Overridepublic void banana() / TODO Auto-generated method stubOverridepublic void pear() / TODO Auto-generated method stubpackage SSeventh;public class banana implements Fruit public void banana() / TODO Auto-generated method stubSystem.out.println(创建了一个香蕉类的对象);Overridepublic void apple() / TODO Auto-generated method stubOverridepublic void pear() / TODO Auto-generated method stubpackage SSeventh;public interface Fruit void apple(); void banana(); void pear();package SSeventh;public class pear implements Fruit public void pear() / TODO Auto-generated method stubSystem.out.println(创建了一个梨子类的对象);Overridepublic void apple() / TODO Auto-generated method stubOverridepublic void banana() / TODO Auto-generated method stubpackage SSeventh;import java.util.Scanner;public class Test public static void main(String args) / TODO Auto-generated method stub/Fruit f=new banana();Scanner input=new Scanner(System.in);System.out.println(请输入您要创建的类：);String attr=input.nextLine();if(attr.equals(banana)Fruit fruit=new banana();fruit.banana();else if(attr.equals(apple)Fruit fruit = new apple();fruit.apple();else if(attr.equals(pear)Fruit fruit =new pear();fruit.pear();else System.out.println(输入有误！);实验结果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）附录：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;Re