• 第十二周练习


    1、设计个类,分别是:(知识点:抽象类及抽象方法)

    1Shape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。

    22个子类:

      1Rectangle表示矩形类,增加两个属性,Width表示长度、height表示宽度,重写getPergetAreashowAll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)。

      2Circle表示圆类,增加1个属性,radius表示半径,重写getPergetAreashowAll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 com.gyq.chapterOne;
    
    public abstract class Shape1 {
        protected double area;
        protected double per;
        protected String color;
        
        public Shape1() {
            
        }
        
        public Shape1(String color) {
            super();
            this.color = color;
        }
    
        public String getColor() {
            return color;
        }
    
        public void setColor(String color) {
            this.color = color;
        }
    
        public abstract void getArea();
        public abstract void getPer();
        public abstract void showAll();
        
    }
    package com.gyq.chapterOne;
    
    import java.awt.Color;
    
    public class Rectangle1 extends Shape1{
        private int width;
        private int height;
        
        public Rectangle1() {
    
        }
        
        public Rectangle1(int width, int height,String color) {
            super(color);
            this.width = width;
            this.height = height;
        }
    
        @Override
        public void getArea() {
            area = width * height;
        }
    
        @Override
        public void getPer() {
            per = (width + height) * 2;    
        }
    
        @Override
        public void showAll() {
            System.out.println("矩形面积为:"+area+",举行周长为:"+per+",矩形颜色为:"+color);
        }
        
    }
    package com.gyq.chapterOne;
    
    public class Circle1 extends Shape1{
        private int radius;
        
        public Circle1() {
            super();
            // TODO Auto-generated constructor stub
        }
        
        public Circle1(int radius,String color) {
            super(color);
            this.radius = radius;
        }
    
        @Override
        public void getArea() {
            area = radius * radius * 3.14;
        }
    
        @Override
        public void getPer() {
            per = 2 * radius * 3.14;
        }
    
        @Override
        public void showAll() {
            System.out.println("圆的面积为:"+area+",周长为:"+per+",颜色为:"+color);
        }
    }
    package com.gyq.chapterOne;
    
    public class PolyDeom {
    
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            Rectangle1 r = new Rectangle1(3, 4, "蓝");
            Circle1 c = new Circle1(2, "黄");
            r.getArea();
            r.getPer();
            r.showAll();
            c.getArea();
            c.getPer();
            c.showAll();
        }
    
    }

    2Cola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 com.gyq.chapterOne;
    
    public class ColaEmployee {
        protected String name;
        protected int birthday;
        
        public ColaEmployee() {
            
        }
    
        public ColaEmployee(String name, int birthday) {
            super();
            this.name = name;
            this.birthday = birthday;
        }
    
        public double getSalary(int month) {
            return 0;
        }
    }
    package com.gyq.chapterOne;
    
    public class SalariedEmployee extends ColaEmployee{
        double Salary;
    
        public SalariedEmployee() {
            super();
            // TODO Auto-generated constructor stub
        }
    
        public SalariedEmployee(double salary,String name, int birthday) {
            super(name, birthday);
            this.Salary = salary;
        }
        public double getSalary(int month) {
            if (super.birthday==birthday) {
                return Salary + 100;
            } else {
                return Salary;
            }
            
        }
        
    }
    package com.gyq.chapterOne;
    
    public class HourlyEmployee extends ColaEmployee{
        int hourSalary;
        int hour;
        public HourlyEmployee() {
            super();
            // TODO Auto-generated constructor stub
        }
        
        public HourlyEmployee(int hourSalary, int hour,String name, int birthday) {
            super(name, birthday);
            this.hourSalary = hourSalary;
            this.hour = hour;
        }
        public double getSalary(int month) {
            if (super.birthday==birthday) {
                if (hour>160) {
                    return hourSalary * 160 + hourSalary * (hour - 160) * 1.5 +100;
                } else {
                    return hourSalary*hour+100;
                }
            } else {
                if (hour>160) {
                    return hourSalary * 160 + hourSalary * (hour - 160) * 1.5;
                } else {
                    return hourSalary*hour;
                }
            }
            
        }
    }
    package com.gyq.chapterOne;
    
    public class SalesEmployee extends ColaEmployee{
        int monthSales;
        double add;
        public SalesEmployee() {
            super();
            // TODO Auto-generated constructor stub
        }
        
        public SalesEmployee(int monthSales, double add,String name, int birthday) {
            super(name, birthday);
            this.monthSales = monthSales;
            this.add = add;
        }
        public double getSalary(int mon) {
            if (super.birthday==birthday) {
                return monthSales*add+100;
            } else {
                return monthSales*add;
            }
        }
    }
    package com.gyq.chapterOne;
    
    import java.time.Month;
    
    public class Company {
        public void getSalary(ColaEmployee a,int month) {
            System.out.println(a.name + "在" + month + "月的月薪为" + a.getSalary(month) + "元");
        }
    }
    package com.gyq.chapterOne;
    
    public class TestCompany {
    
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            ColaEmployee[] a= {new SalariedEmployee(10000,"James",4),new HourlyEmployee(60, 200, "Licy", 10),new SalesEmployee(9000, 1.8, "Coco", 2)};
            for (int i = 0; i < a.length; i++) {
                new Company().getSalary(a[i], 4);
            }
        }
    
    }

    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 com.gyq.chapterOne;
    
    public interface Fruit {
        
    }
    package com.gyq.chapterOne;
    
    public class Apple implements Fruit{
        public Apple() {
            System.out.println("创建了一个苹果对象");
        }
    }
    package com.gyq.chapterOne;
    
    public class Banana implements Fruit{
        public Banana() {
            System.out.println("创建了一个香蕉对象");
        }
    }
    package com.gyq.chapterOne;
    
    public class Grape implements Fruit{
        public Grape() {
            System.out.println("创建了一个葡萄对象");
        }
    }
    package com.gyq.chapterOne;
    
    import java.util.Scanner;
    
    public class Gardener {
        public Fruit create() {
            System.out.println("请输入你想要创建的水果对象");
            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 com.gyq.chapterOne;
    
    public class FruitDeom {
    
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            Gardener g = new Gardener();
            g.create();
        }
    
    }

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  • 原文地址:https://www.cnblogs.com/guoyongqi-blog/p/12930298.html
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