第十二周上机

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 Task2;

public abstract class Shape {
    private int area;
    private int per;
    private String color;

    public Shape() {
        super();
    }

    public Shape(String color) {
        super();
        this.color = color;
    }

    public abstract void getArea();

    public abstract void getPer();

    public abstract void showAll();

    public void getColor() {
        System.out.println("颜色为:" + this.color);

    }
}
package Task2;

public class Rectangle extends Shape {
    private int Width;
    private int height;

    public Rectangle() {

    }

    public Rectangle(int width, int height, String color) {
        super(color);
        this.Width = width;
        this.height = height;
    }

    public void getArea() {
        System.out.println("矩形的面积为:" + this.Width * this.height);

    }

    public void getPer() {
        System.out.println("矩形的周长为:" + 2 * (this.Width + this.height));

    }

    public void showAll() {
        System.out.println("长为:" + this.height + "宽为:" + this.Width);
        this.getArea();
        this.getPer();
        getColor();
    }

}
package Task2;

public class Circle extends Shape {
    private double radius;

    public Circle(double radius, String color) {
        super(color);
        this.radius = radius;
    }

    public void getArea() {
        System.out.println("圆的面积为:" + this.radius * this.radius * 3.14);

    }

    public void getPer() {
        System.out.println("圆的周长为:" + 2 * this.radius * 3.14);

    }

    public void showAll() {
        System.out.println("半径为:" + this.radius);
        this.getArea();
        this.getPer();
        getColor();
    }

}
package Task2;

public class PolyDemo {

    public static void main(String[] args) {
        Shape f = new Rectangle(2, 4, "黄色");
        Shape y = new Circle(2, "蓝色");

        f.showAll();
        y.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,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 Eleven;

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 Eleven;

public class SalariedEmployee extends ColaEmployee {
    private double monthSalary;

    public SalariedEmployee() {
        super();
    }

    public SalariedEmployee(String name, int month, double monthSalary) {
        super(name, month);
        this.monthSalary = monthSalary;
    }

    public double getSalary(int month) {
        if (super.month == month) {
            return monthSalary + 100;
        } else {
            return monthSalary;
        }
    }

}
package Eleven;

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 Eleven;

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 Eleven;

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

}
package Eleven;

public class TestCompany {

    public static void main(String[] args) {
        ColaEmployee[] all = { new SalariedEmployee("拿固定工资的员工", 6, 50000), 
                new HourlyEmployee("按小时拿工资的员工", 6, 100, 300), 
                new SalesEmployee("销售人员", 3, 7000000, 0.4)
        };
        for (int i = 0; i < all.length; i++) {
            new Company().getSalary(all[i], 6);
        }
    }
}

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 Twelve;

public interface Fruit {

}
ackage Twelve;

public class Apple implements Fruit{

    public Apple() {
        System.out.println("创建了一个苹果类的对象");
    }

}
package Twelve;

public class Banana implements Fruit {

    public Banana() {
        System.out.println("创建了一个香蕉类的对象");
    }

}
package Twelve;

public class Grape implements Fruit {

    public Grape() {
        System.out.println("创建了一个葡萄类的对象");
    }

}
package Twelve;

import java.util.*;

public class Gardener {

    public void create() {
        Scanner input = new Scanner(System.in);
        String name = input.next();
        if (name.equals("苹果")) {
            new Apple();
        } else if (name.equals("香蕉")) {
            new Banana();
        } else if (name.equals("葡萄")) {
            new Grape();
        } else {
            System.out.println("请输入正确的对象");
        }
        
    }

}
package Twelve;

public class FruitTest {

    public static void main(String[] args) {
        Gardener a = new Gardener();
        a.create();

    }

}

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转载自www.cnblogs.com/wxyailjy/p/12929707.html