5.21

时间:2020-05-21
本文章向大家介绍5.21,主要包括5.21使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。
package ffff;
import java.util.Scanner;


    

public    interface Shuiguo{
        
    }

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

    class bunana implements Shuiguo {
        public bunana () {
            System.out.println("创建了一个香蕉对象");
        }
    }

    class putao implements Shuiguo {
        public void putao() {
            System.out.println("创建了一个葡萄对象");
        }
    }
    
    class Gardener{
        public Shuiguo create() {
            Scanner input = new Scanner(System.in);
            String name = input.next();
            
            Shuiguo shuiguo = null;
            switch(name){
            case "苹果":
                shuiguo = new Apple();
                break;
            case "香蕉":
                shuiguo = new bunana();
                break;
            case "葡萄":
                shuiguo = new putao();
                break;
            }
            
            input.close();
            
            return shuiguo ;
        }
    }
public class Test1 {

    public static void main(String[] args) {
        Gardener g = new Gardener();
        g.create();

    }

}

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 ffff;

public abstract class Shape {
protected int area;
protected int per;
protected String color;
public Shape() {

// TODO Auto-generated constructor stub
}

public Shape( String color) {

this.color = color;
}

public abstract void getArea();
public abstract void getPer();
public abstract void showall();
}

package ffff;

public class Rwctangle extends Shape{
  private int chang;
  private int kuan;
  
    public Rwctangle() {
    
    // TODO Auto-generated constructor stub
}

public Rwctangle(String color) {
    super(color);
    // TODO Auto-generated constructor stub
}

    public Rwctangle(int chang, int kuan,String color) {
    super();
    this.chang = chang;
    this.kuan = kuan;
    this.color=color;
}

    @Override
    public void getArea() {
        // TODO Auto-generated method stub
        System.out.println("面积为"+chang*kuan);
    }

    @Override
    public void getPer() {
        // TODO Auto-generated method stub
        System.out.println("周长为"+2*(chang+kuan));
    }

    @Override
    public void showall() {
        // TODO Auto-generated method stub
        System.out.println(chang+kuan+color);
    }

}
package ffff;


    public class Circle extends Shape {
        double radius;

        public Circle() {

        }

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

        @Override
        public void getArea() {
            // TODO Auto-generated method stub
            area=(int) (radius*radius*3.14);
        }

        @Override
        public void getPer() {
            // TODO Auto-generated method stub
            per=(int) (2*3.14*radius);
        }

        @Override
        public void showall() {
            // TODO Auto-generated method stub
            System.out.println("面积"+area+"周长"+per+"颜色"+color);
        }

    }
package ffff;

public class tese2 {
     Rwctangle r=new Rwctangle(5,5,"ss");
     Circle c= new Circle(4,"kk");
     r.getArea();
     r.getper();
     r.showall;
     
     c.getArea();
     c.getper();
     c.showall;
    
     }
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
ffff; public class ColaEmployee { String name; int month; public ColaEmployee() { super(); // TODO Auto-generated constructor stub } public ColaEmployee(String name, int month) { super(); this.name = name; this.month = month; } public double getSalary(int mouth){ return 0; } }
package ffff;

public class SalariedEmployee extends ColaEmployee {
        double salary;

        

        public SalariedEmployee(String name, int month,double salary) {
            super(name, month);
            this.salary=salary;
            // TODO Auto-generated constructor stub
        }
        public double getSalary(int mouth){
            if(super.month==month){
                
            return salary+1000;
            }
            else{
                return salary;
            }
        }
}
package ffff;

public class HourlyEmployee extends ColaEmployee{
       private int   hoursalary;
       private int hour;
    
    public HourlyEmployee(String name, int month,int hoursalary,int hour) {
        super(name, month);
        this.hoursalary=hoursalary;
        this.hour=hour;
        
        // TODO Auto-generated constructor stub
    }
    public double getSalary(int mouth){
        if(super.month==mouth){
            if(hour>160){
                return hoursalary*160+hoursalary*(hour-160)*1.5+100;
            }
        }
        else{
            if(hour<160){
                return hoursalary*hour;
            }
        }
        return mouth;
        
    }
       
}
package ffff;

public class SalesEmployee extends ColaEmployee {
    

    
        private int monthSales;
        private double royaltyRate;
        public SalesEmployee( String name,int mouth,int monthSales, double royaltyRate) {
            super(name,mouth);
            this.monthSales = monthSales;
            this.royaltyRate = royaltyRate;
        } 
        public double getSalary(int month) {
               if(super.month == month) {
                   return monthSales * royaltyRate + 100;
               }else {
                   return monthSales * royaltyRate;
               }
           }    
     
      
    }
package ffff;

public class Company {
      public void getSalary(ColaEmployee c,int month) {
            System.out.println(c.name + "在" + month + 
                            "月的月薪是: " + c.getSalary(month)+"元");
       }
}
package ffff;

public class Test4 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ColaEmployee[] cel = {
                new SalariedEmployee("zhangsan", 5, 10000),
                new HourlyEmployee("lisi", 7, 100, 300),
                new SalesEmployee("wangwu", 3, 8000, 0.6)
                };
        for (int i = 0; i < cel.length; i++) {
            new Company().getSalary(cel[i],5);
        }

    }

}

原文地址:https://www.cnblogs.com/xxy02160216/p/12929445.html