• 第十二周上机 张垚


    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 zx;
    
    public abstract class shape {
    	protected double area;
        protected double per;
        protected String color;
     
        public shape() {
     
        }
     
        public void Shape(String color) {
            this.color = color;
        }
     
        public abstract void s();
     
        public abstract void c();
     
        public abstract void showAll();
    }
    package zx;
    
    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 s() {
            area = width * height;
     
        }
     
        public void c() {
            per = (width + height) * 2;
        }
     
        public void showAll() {
            System.out.println("矩形面积为:" + area + ",周长为:" + per+颜色:"+color);
          }
     
    }
    package zx;
    
    public class Circle extends shape{
    	double radius;
    	 
        public Circle() {
     
        }
     
        public Circle(double radius, String color) {
            this.color = color;
            this.radius = radius;
        }
     
        public void s() {
            area = radius * radius * 3.14;
        }
     
        public void c() {
            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 zx;
    
    public class PolyDemo {
    	 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.s();
    	            circle.c();
    	            circle.showAll();
    	             
    	            rectangle.s();
    	            rectangle.c();
    	            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。

    (2) SalariedEmployee : ColaEmployee 的子类,拿固定工资的员工。

    (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。

    (4) SalesEmployee :ColaEmployee 的子类,销售人员,工资由月销售额和提成率决定。

    (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 test;
    
    public class ColaEmployee {
    	 String name;
    	    int month;
    	    public ColaEmployee() {
    
    	    }
    	    public ColaEmployee(String name,int month){
    	        this.name=name;
    	        this.month=month;
    	    }    
    	    public double getSalary(int month) {
    	        return 0;
    	    }
    	}
    package test;
    
    public class SalariedEmployee extends ColaEmployee{
    	  double monSalary;
    	    public SalariedEmployee(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 test;
    
    public class HourlyEmployee extends ColaEmployee{
    	 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 test;
    
    public class SalesEmployee extends ColaEmployee{
    	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 test;
    
    public class Company {
    	 public void getSalary(ColaEmployee c,int month) {
             System.out.println(c.name + "在" + month + 
                             "月的月薪为" + c.getSalary(month)+"元");
        }
    }
    package test;
    
    public class TestCompany {
    	public static void main(String[] args) {
            // TODO Auto-generated method stub
            ColaEmployee[] cel = {
                    new SalariedEmployee("拿固定工资的员工", 6, 54000),
                    new HourlyEmployee("按小时拿工资的员工", 5, 100, 300),
                    new SalesEmployee("销售人员", 3, 6000000, 0.4)
                    };
            for (int i = 0; i < cel.length; i++) {
                new Company().getSalary(cel[i],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 javademo9;
    public interface Fruit{
    		
    	}
    
    	class Apple implements Fruit {
    		public Apple() {
    			System.out.println("创建了一个苹果对象");
    		}
    	}
    
    	class Pear implements Fruit {
    		public Pear() {
    			System.out.println("创建了一个梨对象");
    		}
    	}
    
    	class Orange implements Fruit {
    		public Orange() {
    			System.out.println("创建了一个桔子对象");
    		}
    	}
    
    package javademo9;
    
    import java.util.Scanner;
    
    public 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 "梨":
    				fruit = new Pear();
    				break;
    			case "桔子":
    				fruit = new Orange();
    				break;
    			}
    			
    			input.close();
    			
    			return fruit;
    		}
    }
    package javademo9;
    
    public class Test {
    	public static void main(String[] args) {
    		Gardener g = new Gardener();
    		g.create();
    
    	}
    
    }
    

      

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  • 原文地址:https://www.cnblogs.com/ZXCVBNM1314/p/12929910.html
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