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时间:2020-05-22 13:02:31      阅读:50      评论:0      收藏:0      [点我收藏+]

标签:控制   判断   stat   any   输入   面积   信息   idt   bmon   

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 school4;

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 school4;

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 school4;

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 school4;

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 school4;

public class ColaEmployee {
    String name;
    int bmonth;
    public void getSalary(int month) {
        System.out.println("月份:"+month);
    }
}
package school4;

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 school4;

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 school4;

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 school4;

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 school4;

public class ColaEmployee {
    String name;
    int bmonth;
    public void getSalary(int month) {
        System.out.println("月份:"+month);
    }
}
package school4;

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 school4;

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 school4;

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 school4;

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:

package school4;

public class Apple implements Fruit {
    public Apple() {
        System.out.println("创建了一个苹果对象");
    }
}
package school4;

public class Banana implements Fruit{
    public Banana() {
        System.out.println("创建一个香蕉类的对象");
    }
}
package school4;

public class Grape implements Fruit{
    public Grape() {
        System.out.println("创建一个葡萄类的对象");
    }

}
package school4;

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");
        }
    }

}

 

(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:

521上机

标签:控制   判断   stat   any   输入   面积   信息   idt   bmon   

原文地址:https://www.cnblogs.com/527x/p/12936393.html

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