面向对象技术Java期末复习试卷(五).doc

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 Volunteerpublic abstract String volunteer(String organization);class Personprivate String name;public Person()public Person(String name) = name;Overridepublic String toString()return 姓名 + + n;class Student extends Person implements Volunteerprivate 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)super(name);this.grade = grade;Overridepublic String toString()return super.toString() +年级 + this.grade + n;Overridepublic String volunteer(String organization)return organization;public class Testpublic static void main(String args)Student student = new Student(Tom,1);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10。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 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 (this.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; public 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() return 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; public 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() 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), 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、Faculty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 Volunteerpublic 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 String 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 volunteer(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、Faculty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 Volunteerpublic abstract String volunteer(String organization);class Person private String name; public Person() public Person(String name) = 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 SENIOR = 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_ASSISTAN