• 上机作业


    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 huaerzi;
    
    public abstract class homework {
        protected double area;
        protected double per;
        protected String color;
        public Shape() {
    
        }
    
        public Shape(String color) {
            this.color = color;
        }
    
        public abstract void s();
    
        public abstract void c();
    
        public abstract void showAll();
    }
    package huaerzi;
     
    public class homework {
        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 s() {
            area = width * height;
     
        }
     
        @Override
        public void c() {
          
            per = (width + height) * 2;
        }
     
      
        public void showAll() {
            
            System.out.println("矩形面积是:" + area + ",周长是:" + per+",颜色:"+color);
        }
     
    }
    package huaerzi;
    
    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:" + area + ",周长:" + per + ",颜色:" + color);
        }
    }
    package huaerzi;
    
    public class homework {
        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 huaerzi;
    
    public class homework{
        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 huaerzi;
    
    public class SalariedEmployee extends ColaEmployee {
        double monSalary;
    
        public SalariedEmployee() {
            super();
            
        }
    
        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 huaerzi;
    
    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 huaerzi;
    
    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 huaerzi;
    
    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 huaerzi;
    
    public class Text {
        public static void main(String[] args) {
            ColaEmployee[] cel = { new SalariedEmployee("salariedEmployee", 6, 25000), 
                    new HourlyEmployee("hourlyEmployee", 5, 200, 200), 
                    new SalesEmployee("salesEmployee", 3, 60000, 0.3)
            };
          
            for (int i = 0; i < cel.length; i++) {
                new Company().getSalary(cel[i], 7);
            }
        }
    
    }

    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 huaerzi;
    
    public class Apple implements Fruit {
        public Apple() {
            System.out.println("创建了一个苹果类对象");
        }
    }
    package  huaerzi;
    
    public class Banana implements Fruit {
        public Banana() {
            System.out.println("创建了一个香蕉类对象");
        }
    }
    
    
    
    package  huaerzi;
    
    public class Grape implements Fruit {
        public Grape() {
            System.out.println("创建了一个葡萄类对象");
        }
    }
    
    
    package  huaerzi;
    import java.util.Scanner;
    
    public class Gardener {
        public void creater() {
            String s = "";
            Scanner input = new Scanner(System.in);
            s = input.nextLine();
            if (s.equals("苹果")) {
                new Apple();
            } else if (s.equals("香蕉")) {
                new Banana();
            } else if (s.equals("葡萄")) {
                new Grape();
            } else {
                System.out.println("请输入正确的对象");
            }
        }
    
    }
    
    
    package  huaerzi;
    
    public class Text {
        public static void main(String[] args) 
            new Gardener().creater();
    
        }
    }
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  • 原文地址:https://www.cnblogs.com/reddead/p/12930132.html
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