第十二周上机练习

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 nbnb;

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

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

public class Circle extends Shape{
    double radius;
    public Circle() {
 
    }
    public Circle(double radius, String color) {
        this.color = color;
        this.radius = radius;
    }
    @Override
    public double getArea() {
        return area = radius * radius * 3.14;
    }
    @Override
    public double getPer() {
        return per = 2 * radius * 3.14;
    }
    @Override
    public double showAll() {
        System.out.println("圆的面积为:" + area + ",周长为:" + per + ",颜色:" + color);
        return radius;
    }

}
package nbnb;

public class PolyDome {
    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.getArea();
        circle.getPer();
        circle.showAll();
        rectangle.getArea();
        rectangle.getPer();
        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。

  • 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 as;

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

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 as;

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 as;

public class Company {
    public void method(ColaEmployee a) {
        if(a instanceof HourlyEmployee) {
            HourlyEmployee H =(HourlyEmployee)a;
            H.hourSalary("1",20,30,16,23);
        }else if(a instanceof SalariedEmployee) {
            SalariedEmployee S=(SalariedEmployee)a;
            S.gudingSalar("2",100,2,9);
        }else if(a instanceof SalesEmployee) {
            SalesEmployee s = (SalesEmployee)a;
            s.xiaoshouSalar("3",96,3,7,6);
        }
    }
}
package as;

public class TestCompany {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        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”);

}

}

package as;
import java.util.Scanner;
interface Fruit{
    
}
class Apple implements Fruit {
    public Apple() {
        System.out.println("创建了一个苹果对象");
    }
}
class Banana implements Fruit {
    public Banana() {
        System.out.println("创建了一个香蕉对象");
    }
}
class Putao implements Fruit {
    public Putao() {
        System.out.println("创建了一个葡萄对象");
    }
}
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 "香蕉":
            fruit = new Banana();
            break;
        case "葡萄":
            fruit = new Putao();
            break;
        }
        input.close();
        return fruit;
    }
}
package as;

public class Test {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Gardener g = new Gardener();
        g.create();
    }
}

原文地址:https://www.cnblogs.com/zxp-0101/p/12929631.html