5.21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 duotaishangji;

public abstract class Shape {
    
    double area;
    double per;
    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(String color) {
        this.color=color;
    }
}
package duotaishangji;

public class Rectangle extends Shape {

    int width;
    int height;
    
    
    public Rectangle() {
        super();
    }

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

    @Override
    public void getArea() {
        // TODO Auto-generated method stub
        System.out.println("面积是"+width*height);
    }

    @Override
    public void getPer() {
        // TODO Auto-generated method stub
        System.out.println("周长是"+2*(width+height));
    }

    @Override
    public void showAll() {
        // TODO Auto-generated method stub
        getArea();
        getPer();
    }
     
}
package duotaishangji;

public class Circle extends Shape {
     double radius;
     
    public Circle() {
        super();
    }

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

    @Override
    public void getArea() {
        // TODO Auto-generated method stub
        System.out.println("面积是"+3.14*radius*radius);
    }

    @Override
    public void getPer() {
        // TODO Auto-generated method stub
        System.out.println("周长是"+2*radius*3.14);
    }

    @Override
    public void showAll() {
        // TODO Auto-generated method stub
        getArea();
        getPer();
    }
    
}
package duotaishangji;

public class PolyDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Rectangle r = new Rectangle();
        Rectangle r1 = new Rectangle(2,3,"白色");
        Circle c = new  Circle();
        Circle c1 = new  Circle(2.5,"白色");
        r1.showAll();
        c1.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。

  • 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。

  • 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。

  • 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。

  • 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 duojie;

public class ColaEmployee {
    
    String name;
    int birthmonth;
    
    public void getSalary(int month) {
        System.out.println("月份:"+month);
    }
}
package duojie;

public class SalariedEmployee extends  ColaEmployee {
    int monthmoney;
    public void gudingSalar(String name,int month,int birthday,    int monthmoney) {
        if(month==birthday) {
            System.out.println(name+"工资是"+(monthmoney+100));
            }else {
                System.out.println(name+"工资是"+monthmoney);
            }
    
    }
}
package duojie;


public class HourlyEmployee extends ColaEmployee {
    int hoursal;
    int mouthhour;
    public void hourSalary(String name,int hoursal,int mouthhour,int birthmonth,int month) {
        if(month==birthmonth) {
            if(mouthhour<=160 && mouthhour>0) {
            System.out.println(name+"工资是"+(hoursal*mouthhour)+100);
            }else {
                System.out.println(name+"工资是"+(((mouthhour-160)*hoursal+(hoursal*160))+100));
            }
        }else {
            if(mouthhour<=160 && mouthhour>0) {
                System.out.println(name+"工资是"+(hoursal*mouthhour));
                }else {
                    System.out.println(name+"工资是"+(((mouthhour-160)*hoursal+(hoursal*160))));
                }
        }
    }
}
package duojie;

public class SalesEmployee extends ColaEmployee{
    int monthxiaoshou;
    int tichenglv;
    
    public void xiaoshouSalar(String name,int monthxiaoshou,int tichenglv,int birthmonth,int month) {
        if(month==birthmonth) {
            System.out.println(name+"工资是"+(monthxiaoshou*(1+tichenglv)+100));
        }else {
            System.out.println(name+"工资是"+(monthxiaoshou*(1+tichenglv)));
        }
    }
}
package duojie;

public class Company {
    public void method(ColaEmployee a) {
        if(a instanceof HourlyEmployee) {
            HourlyEmployee H =(HourlyEmployee)a;
            H.hourSalary("张三",30,180,7,7);
        }else if(a instanceof SalariedEmployee) {
            SalariedEmployee S=(SalariedEmployee)a;
            S.gudingSalar("李四", 8, 8, 20000);
        }else if(a instanceof SalesEmployee) {
            SalesEmployee s = (SalesEmployee)a;
            s.xiaoshouSalar("王五",5000,2,6,6);
        }
    }
}
package duojie;

public class TestCompany {

    public static void main(String[] args) {
        Company C = new Company();
        HourlyEmployee c= new HourlyEmployee();
        C.method(c);
        SalariedEmployee s = new SalariedEmployee();
        C.method(s);
        SalesEmployee m = new SalesEmployee();
        C.method(m);
        
    }

}

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”);

}

}

(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。

 

package jiekou1;

public interface Fruit {
    public void method();
}
package jiekou1;

public class Apple implements Fruit{

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

    @Override
    public void method() {
        // TODO Auto-generated method stub
        new Apple();
    }
}
package jiekou1;

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

    @Override
    public void method() {
        // TODO Auto-generated method stub
        new Oranges();
    }
}
package jiekou1;

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

    @Override
    public void method() {
        // TODO Auto-genera();ted method stub
        new Pear();
    }
}
package jiekou1;

import java.util.Scanner;

public class test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner a = new Scanner(System.in);
        String next= a.next();
         if(next.equals("苹果")){
             new Apple();
         }else if(next.equals("葡萄")){
             new Oranges();
         }else if(next.equals("香蕉")) {
             new Pear();
         }else {
             System.out.println("没有此类");
         }
    }

}

 

posted @ 2020-05-21 12:00  崔哥会花手  阅读(94)  评论(0编辑  收藏  举报