• 第十二周作业


    1、设计四个类,分别是:(知识点:抽象类及抽象方法)

    (1)Shape表示图形类,有面积属性area、周长属性per,颜色属性color,有两个构造方法(一个是默认的、一个是为颜色赋值的),还有3个抽象方法,分别是:getArea计算面积、getPer计算周长、showAll输出所有信息,还有一个求颜色的方法getColor。

    (2)2个子类:

    1)Rectangle表示矩形类,增加两个属性,Width表示长度、height表示宽度,重写getPer、getArea和showAll三个方法,另外又增加一个构造方法(一个是默认的、一个是为高度、宽度、颜色赋值的)。

    2)Circle表示圆类,增加1个属性,radius表示半径,重写getPer、getArea和showAll三个方法,另外又增加两个构造方法(为半径、颜色赋值的)。

     (3)一个测试类PolyDemo,在main方法中,声明创建每个子类的对象,并调用2个子类的showAll方法。

    package sg;
    
    public abstract class Shape {
        double area;
        double per;
        String color;
        public Shape() {
            
        }
        public Shape(double area,double per,String color) {
            this.area=area;
            this.per=per;
            this.color=color;
        }
        public Shape(String color) {
            this.color=color;
        }
        public String getColor() {
            return color;
        }
        public abstract double getArea() ;
        public abstract double getPer();
        public abstract void showAll();
        
    }
    package sg;
    
    public class Rectangle extends Shape {
        double width;
        double height;
        
        public Rectangle(double width,String color, double height) {
            super(color);
            this.width=width;
            this.height=height;
            
        }
        @Override
        public double getArea() {
            return area=width*height;
            
        }
        @Override
        public double getPer() {
            return per=width*2+height*2;
            
        }
        @Override
        public void showAll() {
            
            System.out.println("图形的面积为"+getArea()+",周长为"+getPer()+",颜色为"+getColor());
    
        }
        
        
    }
    package sg;
    
    public class Circle extends Shape{
        double radius;
        
        public Circle(double radius,String color) {
            super(color);
            this.radius=radius;
            
            
        }
        @Override
        public double getArea() {
            return area=4*3.14*radius*radius;
        }
        @Override
        public double getPer() {
            return per=2*3.14*radius;
        }
        @Override
        public void showAll() {
            System.out.println("图形的面积为"+getArea()+",周长为"+getPer()+",颜色为"+getColor());
    
        }
        
    }
    package sg;
    
    public class PolyDemo {
        public static void main(String[] args) {
            Rectangle r=new Rectangle(3, "红色", 4);
            Circle c=new Circle(2.1, "蓝色");
            r.showAll();
            c.showAll();
        }
        
        
    }

    2、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。

    Ÿ   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。

    Ÿ   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。

    Ÿ   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。

    Ÿ   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。

    package sg;
    
    public class ColaEmployee {
        String name;
        int month;
              
        public ColaEmployee() {
             super();
                 
          }
            
        
        public ColaEmployee(String name, int month) {
              super();
              this.name = name;
              this.month = month;
          }
         
         
        public double getSalary(int month){    
              return month;
          }
         
    }
    package sg;
    
    public class SalariedEmployee extends ColaEmployee{
         double monthsalary ;
          
         public SalariedEmployee() {
               super();
                 
            }
         
         public SalariedEmployee(String name, int mouth ,double monthsalary) {
               super(name, mouth);
               this.monthsalary = monthsalary;
                 
            }
          @Override
          public double getSalary(int month) {
                  
               if (super.month == month) {
                       return monthsalary + 100;
               } else {
                        return monthsalary;
               }
         
            }
    }
    package sg;
    
    public class HourlyEmployee extends ColaEmployee{
        int hourSalary;
        int hour;
          
        public HourlyEmployee() {
               super();
        }
        
        public HourlyEmployee(String name, int month, int hourSalary, int hour) {
               super(name, month);
               this.hourSalary = hourSalary;
               this.hour = hour;
        }
        @Override
         
        public double getSalary(int month) {
               if(super.month == month){
                    if (hour > 160) {
                         return hourSalary * 160+ (hour-160)*1.5*hourSalary + 100;
                    }else {
                         return hourSalary * hour + 100;
                    }
               }else{
                     if (hour > 160) {
                         return hourSalary * 160 +(hour - 160)*1.5*hourSalary  ;
                    }else {
                         return hourSalary * hour;
                    }
                    
                }
        }
    }
    package sg;
    
    public class SalesEmployee extends ColaEmployee{
        double monthsalary;
        double monthcommission ;
        public SalesEmployee(String string, int i, int j, double d) {
              super();
                 
        }
        public SalesEmployee(String name,int month,double monthsalary, double monthcommission) {
              super(name,month);
              this.monthsalary = monthsalary;
              this.monthcommission = monthcommission;
        }
        @Override
        public double getSalary(int month) {
              if (super.month == month) {
                     return monthsalary*monthcommission + 100;
              } else {
                     return monthsalary*monthcommission;
              }
        
        }
    }
    package sg;
    
    public class Company {
         public void getSalary(ColaEmployee c, int month) {
                 System.out.println(c.name + "在" + month + "月的月薪是:" + c.getSalary(month) + "元");
        }
    }
    package sg;
    
    public class TestCompany {
         public static void main(String[] args) {
                      
                ColaEmployee[] cel = {
                    new SalariedEmployee("拿固定工资的员工", 1, 8500),
                    new HourlyEmployee("按小时拿工资的员工", 2, 100,85),
                    new SalesEmployee("销售人员", 3, 70000, 0.1)
                };
                for (int i = 0; i < cel.length; i++) {
                    new Company().getSalary(cel[i],3);
                }
                    
                     
            }
    }

    3、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 apple

    {

           public 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:


    package sg;
    import java.util.Scanner;
    public interface Fruit {
        
    }
    class Apple implements Fruit{
        public Apple() {
            System.out.println("创建了一个苹果对象");
        }
        
    }
    class Banana implements Fruit{
        public Banana() {
            System.out.println("创建了一个香蕉对象");
        }
    }
    class Grape implements Fruit{
        public Grape() {
            System.out.println("创建了一个葡萄对象");
        }
    }
    class Gardener{
        public Fruit create() {
            Scanner input = new Scanner(System.in);
            String name = input.next();
             
            Fruit fruit = null;
            switch(name){
            case "苹果":
                fruit = new Apple();
                break;
            case "香蕉":
                fruit = new Banana();
                break;
            case "葡萄":
                fruit = new Grape();
                break;
            }
             
            input.close();
             
            return fruit;
        }
    }
    package sg;
    
    public class Test1 {
        public static void main(String[] args) {
            Gardener g = new Gardener();
            g.create();
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/FALEDA/p/12929744.html
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