第十二周上机作业

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 demo;

public class PolyDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Circle circle = new Circle(2,"break");
        Rectangle rectangle = new Rectangle(3,5,"red");
        circle.s();
        circle.c();
        circle.showAll();
        
        rectangle.s();
        rectangle.c();
        rectangle.showAll();
        
    }


    }
package demo;

public class Rectangle extends Shape  {
    double width;
    double height;

    public Rectangle() {

    }

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

    public void s() {
        
    }

    
    public void c() {
        
    }
    public void shouwAll() {
        System.out.println("矩形面积为:" + area + ",周长为:" + per+",颜色:"+color);
    }
package demo;

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

    }

    public Circle(double radius, String color) {
        this.color = color;
        this.radius = radius;
    }
    public void s() {
        area = radius * radius * 3.14;
    }
    public void c() {
        per = 2 * radius * 3.14;
    }
    public void shouwAll() {
        System.out.println("圆的面积为:" + area + ",周长为:" + per+",颜色:"+color);
    }

        
    }
package demo;

public class PolyDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Circle circle = new Circle(2,"break");
        Rectangle rectangle = new Rectangle(3,5,"red");
        circle.s();
        circle.c();
        circle.showAll();
        
        rectangle.s();
        rectangle.c();
        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 demo;

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 demo;

public class SalariedEmployee extends ColaEmployee {
    double monSalary;
    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 demo;

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 demo;

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 demo;

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 demo;

public class TestCompany {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ColaEmployee[] cel = {
                new SalariedEmployee("salariedEmployee", 6, 30000),//name,month,月薪
                new HourlyEmployee("hourlyEmployee", 5, 100, 300),//name,month,时薪,小时数
                new SalesEmployee("salesEmployee", 3, 7000000, 0.3)//name,month,月销售额,提成率
                };
        //数组遍历
        for (int i = 0; i < cel.length; i++) {
            new Company().getSalary(cel[i],7);
        }
    }
}

3.

 

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:

 

public interface Yuanding {
    void apple();
    void banana();
    void grape();
}
public class Apple  implements Yuanding {
    public void apple() {
      
        System.out.println("创建了一个苹果类的对象");
    }
    public void banana() {
        
    }
    public void grape() {
        
    }
} 

    
public class Banana  implements Yuanding{
    public void banana() {
      
        System.out.println("创建了一个香蕉类的对象");
    }
    public void apple() {

    }
    public void grape() {

    }
}
public class Grape implements Yuanding{
    public void grape() {
        // TODO Auto-generated method stub
        System.out.println("创建了一个葡萄类的对象");
    }
    public void banana() {

    }
    public void apple() {

    }
    
    
    }
import java.util.*;
public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入您要创建的类:");
        String a=input.nextLine();
        if(a.equals("apple")) {
            Yuanding yuanding=new Apple();
            yuanding.apple();
        }
        else if(a.equals("banana")) {
            Yuanding yuanding=new Banana();
            yuanding.banana();
        }
        else if(a.equals("grape")) {
            Yuanding yuanding=new Grape();
            yuanding.grape();
        }
        else System.out.println("输入有误!");
    }


    }

 

posted @ 2020-05-21 11:50  余归-  阅读(113)  评论(0编辑  收藏  举报