Java++开发实战经典第六章课后习题答案.doc

interface ClassName public String getClassName() ;class Company implements ClassNameprivate String className ; public Company()public Company(String className)this.className = className ;public String getClassName()return this.className ;public class ExecDemo01public static void main(String args)ClassName cn = new Company(Company类) ;System.out.println(cn.getClassName() ;abstract class Shapepublic abstract float area() ;class Triangle extends Shapeprivate float foot ;private float height ;public Triangle()public Triangle(float foot,float height)this.setFoot(foot) ;this.setHeight(height) ;public float area()return this.foot * height / 2 ;public void setFoot(float foot)this.foot = foot ;public void setHeight(float height)this.height = height ;public float getFoot()return this.foot ;public float getHeight()return this.height ;class Cycle extends Shapeprivate float radius ;private static final float PI = 3.1415926f ;public Cycle()public Cycle(float radius)this.setRadius(radius) ;public float area()return PI * this.radius * this.radius ;public void setRadius(float radius)this.radius = radius ;public float getRadius()return this.radius ;public class ExecDemo02public static void main(String args)Shape s1 = new Triangle(30.0f,50.6f) ;Shape s2 = new Cycle(25.3f) ;System.out.println(s1.area() ;System.out.println(s2.area() ;abstract class Personprivate String name ;private String addr ;private char sex ;private int age ;public Person()public Person(String name,String addr)this(name,addr,男,0) ;public Person(String name,String addr,char sex,int age)this.setName(name) ;this.setAddr(addr) ;this.setSex(sex) ;this.setAge(age) ;public abstract String getInfo() ;public void setName(String name) = name ;public void setAddr(String addr)this.addr = addr ;public void setSex(char sex)this.sex = sex ;public void setAge(int age)this.age = age ;public String getName()return ;public String getAddr()return this.addr ;public char getSex()return this.sex ;public int getAge()return this.age ;class Student extends Personprivate float math ;private float english ;public Student()public Student(String name,String addr)super(name,addr) ;public Student(String name,String addr,char sex,int age,float math,float english)super(name,addr,sex,age) ;this.setMath(math) ;this.setEnglish(english) ;public String getInfo()return学生信息： + n + t|- 姓名： + super.getName() + n + t|- 年龄： + super.getAge() + n + t|- 地址： + super.getAddr() + n + t|- 性别： + super.getSex() + n + t|- 数学成绩： + this.getMath() + n + t|- 英语成绩： + this.getEnglish() ;public void setMath(float math)this.math = math ;public void setEnglish(float english)this.english = english ;public float getMath()return this.math ;public float getEnglish()return this.english ;public class ExecDemo03public static void main(String args)Person per = new Student(张三,北极,男,30,90.0f,90.0f) ;System.out.println(per.getInfo() ;- - - - - abstract class Employee- private String name ;- private char sex ;- private int age ;- public Employee()- public Employee(String name,char sex,int age)- this.setName(name) ;- this.setSex(sex) ;- this.setAge(age) ;- - public abstract String getInfo() ;- public void setName(String name)- = name ;- - public void setSex(char sex)- this.sex = sex ;- - public void setAge(int age)- this.age = age ;- - public String getName()- return ;- - public char getSex()- return this.sex ;- - public int getAge()- return this.age ;- - - class Manager extends Employee- private String job ;- private float income ;- public Manager()- public Manager(String name,char sex,int age,String job,float income)- super(name,sex,age) ;- this.setJob(job) ;- this.setIncome(income) ;- - public void setJob(String job)- this.job = job ;- - public void setIncome(float income)- this.income = income ;- - public String getJob()- return this.job ;- - public float getIncome()- return this.income ;- - public String getInfo()- return管理层信息： + n + - t|- 姓名： + super.getName() + n + - t|- 年龄： + super.getAge() + n + - t|- 性别： + super.getSex() + n + - t|- 职位： + this.getJob() + n + - t|- 年薪： + this.getIncome() ;- - - class Worker extends Employee- private String dept ;- private float salary ;- public Worker()- public Worker(String name,char sex,int age,String dept,float salary)- super(name,sex,age) ;- this.setDept(dept) ;- this.setSalary(salary) ;- - public String getInfo()- return员工信息： + n + - t|- 姓名： + super.getName() + n + - t|- 年龄： + super.getAge() + n + - t|- 性别： + super.getSex() + n + - t|- 部门： + this.getDept() + n + - t|- 月薪： + this.getSalary() ;- - public void setDept(String dept)- this.dept = dept ;- - public void setSalary(float salary)- this.salary = salary ;- - public String getDept()- return this.dept ;- - public float getSalary()- return this.salary ;- - - public class ExecDemo04- public static void main(String args)- Employee m = new Manager(张三,M,30,技术主管,90.0f) ;- Employee w = new Worker(李四,F,19,后勤,900.0f) ;- System.out.println(m.getInfo() ;- System.out.println(w.getInfo() ;- - - - abstract class Shape- public abstract float area() ;- public abstract float perimeter() ;- - class Triangle extends Shape- private float foot ;- private float height ;- public Triangle()- public Triangle(float foot,float height)- this.setFoot(foot) ;- this.setHeight(height) ;- - public float area()- return this.foot * height / 2 ;- - public float perimeter()- return foot * 3 ;- - public void setFoot(float foot)- this.foot = foot ;- - public void setHeight(float height)- this.height = height ;- - public float getFoot()- return this.foot ;- - public float getHeight()- return this.height ;- - - class Cycle extends Shape- private float radius ;- private static final float PI = 3.1415926f ;- public Cycle()- public Cycle(float radius)- this.setRadius(radius) ;- - public float area()- return PI * this.radius * this.radius ;- - public void setRadius(float radius)- this.radius = radius ;- - public float getRadius()- return this.radius ;- - public float perimeter()- return PI * 2 * this.radius ;- - - public class ExecDemo05- public static void main(String args)- Shape s1 = new Triangle(30.0f,50.6f) ;- Shape s2 = new Cycle(25.3f) ;- System.out.println(s1.area() ;- System.out.println(s1.perimeter() ;- System.out.println(s2.area() ;- System.out.println(s2.perimeter() ;- - - - interface Goods/ 商品- public float getPrice() ;- public String getName() ;- - class ShopCar/ 购物车- private Goods goods ;/ 保存商品- private int foot ; - public ShopCar(int len)- if(len0)- this.goods = new Goodslen ;- else- this.goods = new Goods1 ;/ 至少保持一个大小- - - public void add(Goods goods)/ 向里面增加商品- if(this.footthis.goods.length)- this.goodsthis.foot+ = goods ;/ 添加商品- - - public float check()- float count = 0.0f ;- for(int x=0;xthis.goods.length;x+)- if(this.goodsx!=null)- count += this.goodsx.getPrice() ;- - - return cou