JAVA实验8.doc

浙江经贸职业技术学院实训报告系部_ 班级_ 姓名_ 学号_日期_ 地点_ 指导教师_ 成绩 实验九 JAVA 面向对象编程（5） 【实验目的】1.掌握JAVA语言接口的定义和使用。2.掌握JAVA语言抽象类的声明和使用。3.掌握JAVA语言抽象方法的概念和使用。4.掌握类成员变量及方法的使用。【预习内容】1. JAVA 抽象类的定义格式；2.JAVA 接口定义的语法格式；3.this 和 super关键词的功能和区别；4.JAVA构造方法的重载；5.JAVA多态的概念，及重载和覆盖的区别；第 1 页 共 14 页【实验内容及步骤】1定义一个学生类，包括属性：学号（ID），姓名（name），成绩（score）；构造方法（带三个参数）；每个属性的访问器方法。【程序代码】import java.util.Scanner;class Student String ID = ;String name = ;float Score = 0.0f;Student (String ID, String name, float Score) this.ID = ID; = name;this.Score = Score;public String getID () return ID;public String getName () return name;public float getScore () return Score;public class Test_1 public static void main (String args) Scanner sc = new Scanner(System.in);System.out.println(请输入学号：);String ID = sc.nextLine();System.out.println(请输入姓名：);String name = sc.nextLine();System.out.println(请输入成绩：);float Score = sc.nextFloat();Student a = new Student(01, 小明, 555);System.out.println(学号： + a.getID();System.out.println(姓名： + a.getName();System.out.println(成绩： + a.getScore();【程序运行结果】 2 创建类A1，实现构造方法中输出This is A;创建A1的子类B1，实现构造方法中仅输出This is B;创建B1的子类C1，实现构造方法中仅输出This is C。 【程序代码】class A1 A1 () System.out.println(This is A!);A1 (int i) class B1 extends A1 B1 () super(1);System.out.println(This is B!);B1 (int i) super(1);class C1 extends B1 C1 () super(1);System.out.println(This is C!);public class Test_2 public static void main (String args) A1 a = new A1();B1 b = new B1();C1 c = new C1();【程序运行结果】3定义一个人类（Person），它包含属性：姓名（name）,性别（sex）;带两个参数的构造方法；属性的访问器方法。定义上面人类的子类学生类（Student），包括属性：学号（ID），带参数的构造方法；属性的访问器方法。【程序代码】class Person String Name = null;String Sex = null;Person (String Name, String Sex) this.Name = Name;this.Sex = Sex;public String getName () return Name;public String getSex () return Sex;class Student extends Person String ID = null;Student (String ID) super(wj, 女);this.ID = ID;public String getID () return ID;public class Test_3 public static void main (String args) Person p = new Person(cc, 男);Student s = new Student(01);System.out.println(姓名： + p.getName() + n + 性别： + p.getSex();System.out.println(姓名： + s.getName() + n + 性别： + s.getSex() + n + 学号： + s.getID();【程序运行结果】【练习题】Static关键字与普通变量的区别： 4. 创建一个名称为StaticDemo的类，并声明一个静态变量和一个普通变量。对变量分别赋予10和5的初始值。在main()方法中输出变量值。【程序代码】class StaticDemo static int i = 10;int j = 5;public class Test_4 public static void main (String args) StaticDemo s = new StaticDemo();System.out.println(i = + s.i + nj = + s.j);【程序运行结果】 【练习题】覆盖、继承 5. 建立一个汽车Auto类，包括轮胎个数，汽车颜色，车身重量、速度等成员变量。并通过不同的构造方法创建实例。至少要求： 汽车能够加速，减速，停车。 再定义一个小汽车类Car，继承Auto，并添加空调、CD等成员变量，覆盖加速，减速的方法【程序代码】import java.util.Scanner;class Auto int sum = 4;String color = red;float Weight = 1.0f;float Speed = 0.0f;Auto (int sum, String color, float Weight, float Speed) this.sum = sum;this.color = color;this.Weight = Weight;this.Speed = Speed;public void addSpeed (float Speed) this.Speed += Speed;getSpeed();public void redSpeed (float Speed) this.Speed -= Speed;getSpeed();public void Stop () Speed = 0.0f;System.out.println(已停车);public void getSpeed () System.out.println(汽车当前速度为： + Speed + KM/H);class Car extends Auto String AirConditioning = 无;String CD = 无;Car (int sum, String color, float Weight, float Speed, String AirConditioning, String CD) super(sum, color, Weight, Speed);this.AirConditioning = AirConditioning;this.CD = CD;public void addSpeed (float Speed) this.Speed += Speed;getSpeed();public void redSpeed (float Speed) this.Speed -= Speed;getSpeed();public class Test_5 public static void main (String args) Scanner sc = new Scanner(System.in);Scanner ss = new Scanner(System.in);System.out.println(请输入汽车轮胎数量：);int sum = sc.nextInt();System.out.println(请输入汽车颜色：);String color = ss.nextLine();System.out.println(请输入汽车重量：);float Weight = sc.nextFloat();System.out.println(请输入汽车当前速度：);float Speed = sc.nextFloat();Auto a = new Auto(sum, color, Weight, Speed);System.out.println(请输入要加速多少KM/H：);float addSpeed = sc.nextFloat();a.addSpeed(addSpeed);System.out.println(请输入要减速多少KM/S);float redSpeed = sc.nextFloat();a.redSpeed(redSpeed);a.Stop();System.out.println(请输入汽车轮胎数量：);sum = sc.nextInt();System.out.println(请输入汽车颜色：);color = ss.nextLine();System.out.println(请输入汽车重量：);Weight = sc.nextFloat();System.out.println(请输入汽车当前速度：);Speed = sc.nextFloat();System.out.println(请输入汽车是否有空调或空调种类：);String AirConditioning = ss.nextLine();System.out.println(请输入汽车是否有CD：);String CD = ss.nextLine();Car c = new Car(sum, color, Weight, Speed, AirConditioning, CD);System.out.println(请输入要加速多少KM/H：);addSpeed = sc.nextFloat();c.addSpeed(addSpeed);System.out.println(请输入要减速多少KM/S);redSpeed = sc.nextFloat();c.redSpeed(redSpeed);c.Stop();【程序运行结果】6.（1）封装一个People类型，具有height和weight属性，具有speakHello、averageHeight、averageWeight功能。 （2）封装一类ChinaPeople类型是People的子类，新增chinaMartial功能，override超类的speakHello、averageHeight、averageWeight功能。（3）封装一类AmericanPeople类型是People的子类，新增AmericanBoxing功能，override超类的speakHello、averageHeight、averageWeight功能。 （4）封装一类BeijingPeople类型是ChinaPeople的子类，新增BeijingOpera功能，override超类的speakHello、averageHeight、averageWeight功能。 （5）用一个程序执行入口Test测试上述对象 【程序代码】class People float Height = 175.0f;float Weight = 70.0f;public void speakHello () System.out.println(People:Hello!);public void averageHeight () System.out.println(Peoples averageHeight: + Height + cm);public void averageWeight () System.out.println(Peoples averageWeight: + Weight + KG);class ChinaPeople extends People ChinaPeople () ChinaPeople (float Height, float Weight) this.Height = Height;this.Weight = Weight;public void chinaMartial () System.out.println(chinaMartial);public void speakHello () System.out.println(ChinaPeople:Hello!);public void averageHeight () System.out.println(ChinaPeoples averageHeight: + Height + cm);public void averageWeight () System.out.println(ChinaPeoples averageWeight: + Weight + KG);class AmericanPeople extends People AmericanPeople () AmericanPeople (float Height, float Weight) this.Height = Height;this.Weight = Weight;public void AmericanBoxing () System.out.println(AmericanBoxing);public void speakHello () System.out.println(AmericanPeople:Hello!);public void averageHeight () System.out.println(AmericanPeoples averageHeight: + Height + cm);public void averageWeight () System.out.println(AmericanPeoples averageWeight: + Weight + KG);class BeijingPeople extends ChinaPeople BeijingPeople () BeijingPeople (float Height, float Weight) this.Height = Height;this.Weight = Weight;public void BeijingOpera () System.out.println(BeijingOpera!);public void speakHello () System.out.println(BeijingPeople:你好!);public