• 第12


    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 school;
    
    public class Shape {
        int area;
        int per;
        String color;
        public int getArea(int a,int b) {
            return area=a*b;
        }
        public int getPer(int a,int b) {
            return per=(a+b)*2;
        }
        public String getColor(String c) {
            return color=c;
        }
        public void showAll() {
            System.out.println("图形的面积是:"+area+"周长是:"+per+"颜色是:"+color);
        }
        
        
    }
    package school;
    
    public class Rectangle extends Shape{
        int Width;
        int Height;
        public int getPer(int Width,int Height) {
            return per=(Height+Width)*2;
        }
        public int getArea(int Width,int Height) {
            return area=Height*Width;
        }
        public String getColor(String c) {
            return color=c;
        }
        public void getShowall() {
            System.out.println("长是:"+Height+"宽是:"+Width+"图形的面积是:"+area+"周长是:"+per+"颜色是:"+color);
        }
        
    }
    package school;
    
    public class Circle extends Shape{
        int radius;
        public int getPer(int radius) {
            return per=3*2*radius;
        }
        public int getArea(int radius) {
            return area=3*radius*radius;
        }
        public String getColor(String c) {
            return color=c;
        }
        public void getShowall() {
            System.out.println("半径是:"+radius+"图形的面积是:"+area+"周长是:"+per+"颜色是:"+color);
        }
    }
    package school;
    
    public class PolyDemo {
    
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            Shape s=new Shape();
            s.getArea(5, 7);
            s.getPer(5, 7);
            s.getColor("blue");
            s.showAll();
            Rectangle r=new Rectangle();
            r.Width=10;
            r.Height=8;
            r.getArea(10, 8);
            r.getPer(10, 8);
            r.getColor("red");
            r.getShowall();
            Circle c=new Circle();
            c.radius=5;
            c.getArea(5);
            c.getColor("yellow");
            c.getPer(5);
            c.getShowall();
            
        }
    
    }

    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 school;
    
    public class ColaEmployee {
        String name;
        int bmonth;
        public void getSalary(int month) {
            System.out.println("月份:"+month);
        }
    }
    package school;
    
    public class SalariedEmployee extends ColaEmployee{
        int mmoney;
        public void getsal(String name,int month,int bmonth, int mmoney) {
            if(month==bmonth) {
                System.out.println(name+"工资是:"+(mmoney+100));
            }else {
                System.out.println(name+"工资是:"+mmoney);
            }
            
        }
    }
    package school;
    
    public class HourlyEmployee extends  ColaEmployee{
        public void hsal(String name ,int hoursal,int mhour,int bmonth, int month){
            if(month==bmonth) {
                if(mhour<=160 && mhour>0) {
                    System.out.println(name+"工资是"+(hoursal*mhour)+100);
                }else {
                    System.out.println(name+"工资是"+(((mhour-160)*hoursal+(hoursal*160))+100));
                }
            }else {
                if(mhour<=160 && mhour>0) {
                    System.out.println(name+"工资是"+(hoursal*mhour));
                    }else {
                        System.out.println(name+"工资是"+(((mhour-160)*hoursal+(hoursal*160))));
                    }
            }    
        }
    }
    package school;
    
    public class SalesEmployee extends ColaEmployee {
        int monthxiaoshou;
        int tichenglv;
        public void xiaoshouSalar(String name,int mxiaoshou,int tichenglv,int bmonth,int month) {
            if(month==bmonth) {
                System.out.println(name+"工资是"+(mxiaoshou*(1+tichenglv)+100));
            }else {
                System.out.println(name+"工资是"+(mxiaoshou*(1+tichenglv)));
            }
        }
    }
    package school;
    
    public class Company {
         public void method(ColaEmployee a) {
                if(a instanceof HourlyEmployee) {
                    HourlyEmployee H =(HourlyEmployee)a;
                    H.hsal("张三",45,175,6,6);
                }else if(a instanceof SalariedEmployee) {
                    SalariedEmployee c=(SalariedEmployee)a;
                    c.getsal("李四",7,7,1000);
                }else if(a instanceof SalesEmployee) {
                    SalesEmployee b = (SalesEmployee)a;
                    b.xiaoshouSalar("王五",2000,3,5,6);
                }
            }
    }
    package school;
    
    public class ColaEmployee {
        String name;
        int bmonth;
        public void getSalary(int month) {
            System.out.println("月份:"+month);
        }
    }
    package school;
    
    public class SalariedEmployee extends ColaEmployee{
        int mmoney;
        public void getsal(String name,int month,int bmonth, int mmoney) {
            if(month==bmonth) {
                System.out.println(name+"工资是:"+(mmoney+100));
            }else {
                System.out.println(name+"工资是:"+mmoney);
            }
            
        }
    }
    package school;
    
    public class HourlyEmployee extends  ColaEmployee{
        public void hsal(String name ,int hoursal,int mhour,int bmonth, int month){
            if(month==bmonth) {
                if(mhour<=160 && mhour>0) {
                    System.out.println(name+"工资是"+(hoursal*mhour)+100);
                }else {
                    System.out.println(name+"工资是"+(((mhour-160)*hoursal+(hoursal*160))+100));
                }
            }else {
                if(mhour<=160 && mhour>0) {
                    System.out.println(name+"工资是"+(hoursal*mhour));
                    }else {
                        System.out.println(name+"工资是"+(((mhour-160)*hoursal+(hoursal*160))));
                    }
            }    
        }
    }
    package school;
    
    public class SalesEmployee extends ColaEmployee {
        int monthxiaoshou;
        int tichenglv;
        public void xiaoshouSalar(String name,int mxiaoshou,int tichenglv,int bmonth,int month) {
            if(month==bmonth) {
                System.out.println(name+"工资是"+(mxiaoshou*(1+tichenglv)+100));
            }else {
                System.out.println(name+"工资是"+(mxiaoshou*(1+tichenglv)));
            }
        }
    }
    package school;
    
    public class Company {
         public void method(ColaEmployee a) {
                if(a instanceof HourlyEmployee) {
                    HourlyEmployee H =(HourlyEmployee)a;
                    H.hsal("张三",45,175,6,6);
                }else if(a instanceof SalariedEmployee) {
                    SalariedEmployee c=(SalariedEmployee)a;
                    c.getsal("李四",7,7,1000);
                }else if(a instanceof SalesEmployee) {
                    SalesEmployee b = (SalesEmployee)a;
                    b.xiaoshouSalar("王五",2000,3,5,6);
                }
            }
    }

    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 school;
    
    public class Apple implements Fruit {
        public Apple() {
            System.out.println("创建了一个苹果对象");
        }
    }
    package school;
    
    public class Banana implements Fruit{
        public Banana() {
            System.out.println("创建一个香蕉类的对象");
        }
    }
    package school;
    
    public class Grape implements Fruit{
        public Grape() {
            System.out.println("创建一个葡萄类的对象");
        }
    
    }
    package school;
    
    import java.util.Scanner;
    
    public interface Fruit {
    
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            @SuppressWarnings("resource")
            Scanner s=new Scanner(System.in);
            System.out.println("请输入水果名字:");
            String a=s.next();
            if(a.equals("苹果")) {
                new Apple();
            }else if(a.equals("香蕉")){
                new Banana();
            }else if(a.equals("葡萄")){
                new Grape();
            }else {
                System.out.println("无此类水果");
            }
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/1206wang/p/12966192.html
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