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  • 第十二周上机练习

    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 hsy;
    
    public abstract class Shape {
        protected double area;
        protected double per;
        protected String color;
    
        public Shape() {
    
        }
    
        public Shape(String color) {
            this.color = color;
        }
    
        public abstract void getArea();
    
        public abstract void getPer();
    
        public abstract void showAll();
    
    }
    

      

    package hsy;
    
    public class Rectangle extends Shape {
        double width;
        double height;
    
        public Rectangle() {
    
        }
    
        public Rectangle(double width, double height, String color) {
            super();
            this.width = width;
            this.height = height;
            this.color = color;
        }
    
        @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 + ",周长为:" + per + ",颜色:" + color);
        }
    
    }
    

      

    package hsy;
    public class Circle extends Shape {
        double radius;
    
        public Circle() {
    
        }
    
        public Circle(double radius, String color) {
            this.color = 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:" + color);
        }
    }
    

      

    package hsy;
    
    public class PolyDemo {
        public static void main(String[] args) {
            Circle circle = new Circle(3, "break");
            Rectangle rectangle = new Rectangle(2, 4, "red");
            circle.getArea();
            circle.getPer();
            circle.showAll();
    
            rectangle.getArea();
            rectangle.getPer();
            rectangle.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 hsy;
    
    public class ColaEmployee {
        String name;
        int month;
    
        public ColaEmployee() {
    
        }
    
        public ColaEmployee(String name, int month) {
            super();
            this.name = name;
            this.month = month;
        }
    
        public double getSalary(int month) {
            return 0;
        }
    
    }
    

      

    package hsy;
    
    public class SalariedEmployee extends ColaEmployee {
        double monSalary;
    
        public SalariedEmployee() {
            super();
            // TODO Auto-generated constructor stub
        }
    
        public SalariedEmployee(String name, int month, double monSalary) {
            super(name, month);
            this.monSalary = monSalary;
        }
    
        public double getSalary(int month) {
            if (super.month == month) {
                return monSalary + 100;
            } else {
                return monSalary;
            }
        }
    
    }
    

      

    package hsy;
    
    public class HourlyEmployee extends ColaEmployee {
        private int hourSalary;
        private int hourNum;
    
        public HourlyEmployee(String name, int month, int hourSalary, int hourNum) {
            super(name, month);
            this.hourSalary = hourSalary;
            this.hourNum = hourNum;
    
        }
    
        public double getSalary(int month) {
            if (super.month == month) {
                if (hourNum > 160) {
                    return hourSalary * 160 + hourSalary * (hourNum - 160) * 1.5 + 100;
                } else {
                    return hourSalary * hourNum + 100;
                }
            } else {
                if (hourNum > 160) {
                    return hourSalary * 160 + hourSalary * (hourNum - 160) * 1.5;
                } else {
                    return hourSalary * hourNum;
                }
            }
    
        }
    
    }
    

      

    package hsy;
    
    public class SalesEmployee extends ColaEmployee {
        private int monthSales;
        private double royaltyRate;
    
        public SalesEmployee(String name, int month, int monthSales, double royaltyRate) {
            super(name, month);
            this.monthSales = monthSales;
            this.royaltyRate = royaltyRate;
        }
    
        public double getSalary(int month) {
            if (super.month == month) {
                return monthSales * royaltyRate + 100;
            } else {
                return monthSales * royaltyRate;
            }
        }
    
    }
    

      

    package hsy;
    
    public class Company {
        public void getSalary(ColaEmployee c, int month) {
            System.out.println(c.name + "在" + month + "月的月薪为" + c.getSalary(month) + "元");
        }
    
    }
    

      

    package hsy;
    
    public class Text {
        public static void main(String[] args) {
            // TODO Auto-generated method stub
    
            // 创建、初始化数组
            ColaEmployee[] cel = { new SalariedEmployee("salariedEmployee", 6, 25000), // name,month,月薪
                    new HourlyEmployee("hourlyEmployee", 5, 200, 200), // name,month,时薪,小时数
                    new SalesEmployee("salesEmployee", 3, 60000, 0.3)// name,month,月销售额,提成率
            };
            // 数组遍历
            for (int i = 0; i < cel.length; i++) {
                new Company().getSalary(cel[i], 7);
            }
        }
    
    }
    

      

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  • 原文地址:https://www.cnblogs.com/s2me/p/12929471.html
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