• 最新作业~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~··


    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 chap3;
    
    public abstract class Shape {
        protected double area;
        protected double per;
        protected String color;
    
        public Shape() {
        }
    
        public Shape(String color) {
            this.color = color;
        }
    
        public abstract double getArea();
    
        public abstract double getPer();
    
        public abstract void showAll();
    
        public String getcolor() {
            return this.color;
        }
    
    }
    package chap3;
    
    public class Rectangle extends Shape {
        int weigth;
        int height;
    
        public Rectangle() {
        }
    
        public Rectangle(int weigth, int height, String color) {
            super();
            this.weigth = weigth;
            this.height = height;
            this.color = color;
        }
    
        public double getArea() {
            this.area = weigth * height;
            return this.area;
        }
    
        public double getPer() {
            this.per = 2 * (weigth + height);
            return this.per;
        }
    
        public void showAll() {
            System.out.println("该矩形长为" + this.weigth + ",宽为" + this.height + ",周长为" + this.getPer() + ",面积为"
                    + this.getArea() + ",颜色为" + this.getcolor());
    
        }
    }
    package chap3;
    
    public class Circle extends Shape {
        double radius;
        double pi = Math.PI;
    
        public Circle() {
        }
    
        public Circle(double radius, String color) {
            this.radius = radius;
            this.color = color;
        }
    
        public double getArea() {
            double area = pi * radius * radius;
            return area;
        }
    
        public double getPer() {
            double per = 2 * pi * radius;
            return per;
        }
    
        public void showAll() {
            System.out.println(
                    "半径为" + this.radius + "的圆,周长为" + this.getPer() + ",面积为" + this.getArea() + ",颜色为" + this.getcolor());
        }
    
    }
    package chap3;
    
    public class PolyDemo {
        public static void main(String[] args) {
            Rectangle a = new Rectangle(2, 5, "yellow");
            Circle b = new Circle(2, "black");
            a.showAll();
            b.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。

    (2) SalariedEmployee : ColaEmployee 的子类,拿固定工资的员工。

    (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。

    (4) SalesEmployee :ColaEmployee 的子类,销售人员,工资由月销售额和提成率决定。

    (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 chap3;
    
    public class ColaEmployee {
        String name;
        int month;
        
        public ColaEmployee() {
            super();
            // TODO Auto-generated constructor stub
        }
    
        public ColaEmployee(String name, int month) {
            super();
            this.name = name;
            this.month = month;
        }
        
        public double getSalary(int month) {
            return 0;
        }
    }
    package chap3;
    
    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 chap3;
    
    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 chap3;
    
    public class TestCompany {
    
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            ColaEmployee[] cel= {new SalariedEmployee("jack", 6, 10000),new HourlyEmployee("按小时拿工资的员工", 10, 50, 200),new SalesEmployee("销售人员", 6, 20000, 0.8)};
            for (int i = 0; i < cel.length; i++) {
                new Company().getSalary(cel[i], 8);
            }
        }
    
    }
    package chap3;
    
    public class HourlyEmployee extends ColaEmployee{
        private int hourSalary;
        private int num;
        
        public HourlyEmployee(String name,int month,int hourSalary, int num) {
            super(name,month);
            this.hourSalary = hourSalary;
            this.num = num;
        }
        public double getSalary(int month) {
            if (super.month == month) {
                if (num>160) {
                    return hourSalary * 160 + hourSalary * (num - 160) * 1.5 +100;
                } else {
                    return hourSalary * num + 100;
                }
            } else {
                if (num >160) {
                    return hourSalary * 160 + hourSalary * (num - 160) * 1.5;
                } else {
                    return hourSalary * num;
                }
            }
        }
    }

    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”);

    }

    package chap3;
    
    public class apple implements Fruit {
        public apple() {
            System.out.println("创建了一个苹果类对象");
        }
    
    }
    package chap3;
    
    public interface Fruit {
    
    }
    package chap3;
    
    public class banana implements Fruit {
        public banana() {
            System.out.println("创建了一个香蕉类对象");
        }
    }
    package chap3;
    
    public class grape implements Fruit {
        public grape() {
            System.out.println("创建了一个葡萄类对象");
        }
    
    }
    package chap3;
    
    import java.util.Scanner;
    
    public class gardener {
        public void creater() {
            Scanner input = new Scanner(System.in);
            String a = input.next();
            if (a.equals("苹果")) {
                new apple();
            } else if (a.equals("香蕉")) {
                new banana();
            } else if (a.equals("葡萄")) {
                new grape();
            } else {
                System.out.println("请重新运行");
            }
        }
    
        public static void main(String[] args) {
            new gardener().creater();
        }
    }

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  • 原文地址:https://www.cnblogs.com/skyfail/p/12930089.html
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