面向对象技术Java 期末复习试卷(五)

1、期末复习试卷（五）一、 程序题1、请根据UML图，代码实现Person类、Student类和Volunteer接口的定义。解题要求：编写测试程序，创建一个名为”Tom”的一年级学生，这名学生参加了“北京青年志愿者协会”的活动。输出该学生的姓名、年级及所属社团的信息。效果如下：interface Volunteer  public abstract String volunteer(String organization);class Person  private String name;   public Person()

2、     public Person(String name)     = name;     Override  public String toString()    return "姓名" + + "n"  class Student extends Person implements Volu

3、nteer  private int grade;   public static final int FRESHMAN = 1;  public static final int SOPHOMORE = 2;  public static final int JUNIOR = 3;  public static final int SENIOR = 4;    public Student(String name, int grade) 

4、60;  super(name);    this.grade = grade;     Override  public String toString()    return super.toString() +           "年级" + this.grade + "n&quo

5、t;     Override  public String volunteer(String organization)    return organization;  public class Test  public static void main(String args)    Student student = new Student("Tom",1); 

6、0;      System.out.println(student + "所属社团" + student.volunteer("北京青年志愿者协会") + "n");   2、根据给定的GeometricObject类层次图，分别实现GeometricObject、Circle和Triangle类。要求：（1） 按照类图，定义各类的数据域属性和方法。（2） 默认的GeometricObject的颜色为white。默认的Circle对象的半径为1

7、0。默认的Triangle对象的三边为（3，4，5）。（3） GeometricObject类的toString()方法，返回对象的颜色信息。Circle和Triangle的toString()方法，覆盖父类的toString()，分别返回包括颜色信息、半径或边长的信息。（4） GeometricObject类实现java.lang.Comparable接口，覆盖public int compareTo()方法，实现两个几何对象在周长上的比较。（5） Circle和Triangle类分别覆盖实现getPerimeter()。编写一个用户程序:（1）创建一个几何对象数组object；（2）分别存

8、放一个默认的圆、一个半径为20的圆、一个默认的三角形和一个三边为（10，20，15）的三角形；（3）计算这一组几何对象的总周长并输出；（4）使用toString(),输出每个几何对象的相关信息；（5）使用java.util.Arrays.sort()方法，对几何对象数组中的几何图形，按周长进行排序，并输出排序结果。解题要求：写出程序代码。定义一个Java源文件，名为Test.java，其中包括：用户类Test、GeometricObject类、Circle类和Triangle类的定义。abstract class GeometricObject implements Comparable<

9、;geometricobject> private String color = "white" protected GeometricObject() protected GeometricObject(String color) this.color = color; public String getColor() return color; public void setColor(String color) this.color = color; Override public int compareTo(GeometricObject o) if (thi

10、s.getPerimeter() > o.getPerimeter() return 1; else if (this.getPerimeter() < o.getPerimeter() return -1; else return 0; public String toString() return "颜色" + color + "n" public abstract double getPerimeter();class Circle extends GeometricObject private double radius; publi

11、c Circle() this.radius = 10.0; public Circle(double radius) this.radius = radius; public Circle(String color, double radius) super(color); this.radius = radius; public double getRadius() return radius; public void setRadius(double radius) this.radius = radius; Override public double getPerimeter() r

12、eturn 2 * radius * Math.PI; public String toString() return super.toString() + "圆的半径是" + radius + "n" class Triangle extends GeometricObject private double side1; private double side2; private double side3; public Triangle() this.side1 = 3.0; this.side2 = 4.0; this.side3 = 5.0; p

13、ublic Triangle(double side1 ,double side2, double side3) this.side1 = side1; this.side2 = side2; this.side3 = side3; public Triangle(String color,double side1 ,double side2, double side3) super(color); this.side1 = side1; this.side2 = side2; this.side3 = side3; Override public double getPerimeter()

14、return side1 + side2 + side3; Override public String toString() return super.toString() + "三角形的三条边是" + side1 + " " + side2 + " " + side3 + "n" public class Test public static void main(String args) /创建对象数组 GeometricObject object = new Circle(), new Circle(20),

15、 new Triangle(), new Triangle(10,20,15); double totalPerimeter = 0; /自己学习一下这种for循环的使用方法 for(GeometricObject go:object) totalPerimeter += go.getPerimeter(); System.out.println("The total perimeter is " + totalPerimeter); for(GeometricObject go:object) System.out.println(go.toString(); /*抽象类

16、GeometricObject实现了Comparable接口之后，所有子类（Circle和Triangle）的对象 就可以比较大小了，由此也就可以调用Arrays的sort方法对上面的对象数组排序了。 */ java.util.Arrays.sort(object); for(int i = 0; i < object.length; i+) System.out.println("The " + i + "th short perimeter is " + objecti.getPerimeter(); 3、根据UML图，实现Person类、Fa

17、culty类和Volunteer接口的定义。解题要求：编写用户测试程序，创建一个名为“Jerry”的副教授, 他参加了“北京市慈善义工协会”的活动，输出其姓名、职称和所属社团信息。效果如下：class Person private String name; public Person() public Person(String name) = name; Override public String toString() return "姓名" + + "n"  interface Volunteer&

18、#160;    public abstract String volunteer(String organization); class Faculty extends Person implements Volunteer private String title; public static final String TEACHING_ASSISTANT = "助教" public static final String LECTURER = "讲师" public static final Str

19、ing ASSOCIATE_PROFESSOR = "副教授" public static final String PROFESSOR = "教授" public Faculty(String name,String title) super(name); this.title = title; Override public String toString() return super.toString() + "职称" + this.title + "n" Override public String vol

20、unteer(String organization) return organization; public class TestPerson public static void main(String args) Faculty faculty = new Faculty("Jerry","副教授"); System.out.println(faculty + "所属社团" + faculty.volunteer("北京市慈善义工协会"); 4、请根据UML图,给出类Person 、类Student、Facu

21、lty类和接口Volunteer的定义实现。解题要求：编写测试程序，创建一个名为“Tom”的一年级学生、“北京青年志愿者协会”成员，创建一个名为“JERRY”的助教、“北京市慈善义工协会”成员，输出两个人的姓名、年级和所属志愿者协会的基本信息。效果如下：interface Volunteer  public abstract String volunteer(String organization);class Person private String name; public Person() public Person(String name) =

22、 name; Override public String toString() return "姓名" + + "n" class Student extends Person implements Volunteer private int grade; public static final int FRESHMAN = 1; public static final int SOPHOMORE = 2; public static final int JUNIOR = 3; public static final int SEN

23、IOR = 4; public Student(String name, int grade) super(name); this.grade = grade; Override public String toString() return super.toString() + "年级" + this.grade + "n" Override public String volunteer(String organization) return organization; class Faculty extends Person implements Volunteer private String title; public static final String TEACHING_ASSISTANT = "助教" public static f