第十五次作业

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 ydy57;

public class Point {
    private int x;
    private int y;
    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public int getY() {
        return y;
    }
    public void setY(int y) {
        this.y = y;
    }
    public Point() {
        super();
    }
    
}

package ydy57;

public class shape {
    private Point p;
    private String color;
    
    public double calcArea() {
        return 0;
    }
    
    public double calcPerimeter() {
        return 0;
    }
    
    public shape() {
        super();
    }
    public Point getP() {
        return p;
    }
    public void setP(Point p) {
        this.p = p;
    }
    public String getColor() {
        return color;
    }
    public void setColor(String color) {
        this.color = color;
    }

}

package ydy57;

public class circle {

        private int radius;
     
     
        public circle() {
            super();
        }
        
         public circle(int radius) {
            super();
            this.radius = radius;
        }
     
     
        public double calcArea() {
                return Math.PI * radius * radius;
          }
         
         public double calcPerimeter() {
                return 2 * Math.PI * radius;
          }
         
        public int getR() {
            return radius;
        }
     
     
        public void setR(int r) {
            this.radius = r;
        }
     
    }

package ydy57;

public class Rectangle {


     
    private int length;
    private int width;
 
 
    public Rectangle() {
        super();
    }
    
    public Rectangle(int length, int width) {
        super();
        this.length = length;
        this.width = width;
    }
 
 
    public double calcArea() {
        return length * width;
    }
 
    public double calcPerimeter() {
        return 2 *( length + width);
    }
 
    public int getLength() {
        return length;
    }
    public void setLength(int length) {
        this.length = length;
    }
    public int getWidth() {
        return width;
    }
    public void setWidth(int width) {
        this.width = width;
    }

}

package ydy57;

public class triangle {
    private int length;
    private int height;
    
    public triangle() {
        super();
    }
    
    public triangle(int length, int height) {
        super();
        this.length = length;
        this.height = height;
    }
    public double calcArea() {
        return  (length * height)/2;
    }
    
    public double calcPerimeter() {
        return length +2 *Math.sqrt(((length/2)*(length/2))+(height* height));
    }
    
    public int getLength() {
        return length;
    }
 
 
    public void setLength(int length) {
        this.length = length;
    }
 
 
    public int getHeight() {
        return height;
    }
 
 
    public void setHeight(int height) {
        this.height = height;
    }


}

package ydy57;

public class test {

        public static void main(String args[]) {
            shape s = new shape();
             
             
            circle c = new circle(5);
            System.out.println("圆的面积为：" +c.calcArea());
            System.out.println("圆的周长为：" +c.calcPerimeter());
            
            Rectangle r = new Rectangle(5, 6);
            System.out.println("矩形的面积为：" +r.calcArea());
            System.out.println("矩形的周长为：" +r.calcPerimeter());
            
            triangle t = new triangle(6, 4);
            System.out.println("等腰三角形的面积为：" +t.calcArea());
            System.out.println("等腰三角形的周长为：" +t.calcPerimeter());


        }
    }


   

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 ydy57;

public class test {

    public static void main(String args[]) {
        
        ColaEmployee[] cel = {
                new SalariedEmployee("salariedEmployee", 6, 30000),
                new HourlyEmployee("hourlyEmployee", 5, 100, 300),
                new SalesEmployee("salesEmployee", 3, 7000000, 0.3)
                };


                for (int i = 0; i < cel.length; i++) {
                    new Company().getSalary(cel[i],7);
                }
            }
    
        }



   

package ydy57;

public class ColaEmployee {

    String name;
    int month;
    
    public ColaEmployee() {
    
    }
    
    public ColaEmployee(String name,int month){
        this.name=name;
        this.month=month;
    }
    
    public double getSalary(int month) {
        return 0;
    }

}

package ydy57;

public class HourlyEmployee extends ColaEmployee {
     private int hourSalary;//时薪
     private int hourNum;//每月工作的小时数
     
     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 ydy57;

public class SalesEmployee {
     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 ydy57;

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 ydy57;

public class SalariedEmployee {

double monSalary;//月薪
    
    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;
        }
        
    }

}

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 ydy57;
import java.util.Scanner;

public class SalariedEmployee {

    interface Fruit{
        
    }

    class Apple implements Fruit {
        public Apple() {
            System.out.println("创建了一个苹果对象");
        }
    }

    class Pear implements Fruit {
        public Pear() {
            System.out.println("创建了一个梨对象");
        }
    }

    class Orange implements Fruit {
        public Orange() {
            System.out.println("创建了一个桔子对象");
        }
    }

    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 "梨":
                fruit = new Pear();
                break;
            case "桔子":
                fruit = new Orange();
                break;
            }
            
            input.close();
            
            return fruit;
        }
    }
}

package ydy57;


public class test {

    public static void main(String args[]) {
        

            Gardener g = new Gardener();
            g.create();

        }

    
}