java第十二周作业

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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 chap1;

public abstract class Shape {
     protected double area;
     protected double per;
     protected String color;
     public Shape() {
     }
     public Shape(String color) {
      this.color = color;
     }
     public abstract void getArea();
     public abstract void getPer();
     public abstract void showAll();
    }
package chap1;


    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 getArea() {
          area = width * height;
         }
         public void getPer() {
          per = (width + height) * 2;
         }
         public void showAll() {
          System.out.println("矩形面积为:" + area + ",周长为:" + per+",颜色:"+color);
         }
}
package chap1;

public class Circle extends Shape {
     double radius;
     public Circle() {
     }
     public Circle(double radius, String color) {
      this.color = color;
      this.radius = radius;
     }

     public void getArea() {
      area = radius * radius * 3.14;
     }
     public void getPer() {
      per = 2 * radius * 3.14;
     }
     public void showAll() {
      System.out.println("圆的面积为:" + area + ",周长为:" + per+",颜色:"+color);
     }

}
package chap1;

public class polyDeno {

    public static void main(String[] args) {
        
        // TODO Auto-generated method stub
        Shape c = new Circle(2,"green");
          Shape r = new Rectangle(3,7,"red");
          c.getArea();
          c.getPer();
          c.showAll();
          r.getArea();
          r.getPer();
          r.showAll();
         }
    
}

Cola公司的雇员分为以下若干类:

(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 chap1;

public class ColaEployee {


    String name;
    int month;

    public ColaEployee() {

    }

    public ColaEployee(String name, int month) {
        super();
        this.name = name;
        this.month = month;
    }

    public double getSalary(int month) {
        return 0;
    }
}
package chap1;



public class SalarriedEmloyee extends ColaEployee {
    double monSalary;

    public SalarriedEmloyee() {
        super();
    }

    public SalarriedEmloyee(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 chap1;


public class HourlyEmployee extends ColaEployee {
    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 chap1;



public class SalesEmployee extends ColaEployee {
    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 chap1;

public class Company {


    public void getSalary(ColaEployee c, int month) {
        System.out.println(c.name + "在" + month + "月的月薪为" + c.getSalary(month) + "元");
    }
}

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 chap1;
public interface FruitFruit {
     void apple();
     void banana();
     void putao();
    }
package chap1;

public class Apple implements FruitFruit {
     public void apple() {
          // TODO Auto-generated method stub
          System.out.println("创建了一个苹果类的对象");
         }
         public void banana() {
          
         }
         public void putao() {
          
         }
        }
package chap1;


public class Banana implements FruitFruit{
 public void banana() {
  // TODO Auto-generated method stub
  System.out.println("创建了一个香蕉类的对象");
 }
 public void apple() {

 }
 public void putao() {

 }
}
package chap1;
        public class putao implements FruitFruit{
     public void putao() {
      // 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() {

     }
    }
package chap1;
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")) {
           FruitFruit yuanding=new Apple();
           yuanding.apple();
          }
          else if(a.equals("banana")) {
           FruitFruit yuanding=new Banana();
           yuanding.banana();
          }
          else if(a.equals("putao")) {
          FruitFruit  yuanding=new putao();
           yuanding.putao();
          }
          else System.out.println("输入有误!");
         }
        

    }

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转载自www.cnblogs.com/lutiantian/p/12929792.html