c++和java类的简单实现

电玩女神 2022-09-21 13:20 123阅读 0赞

定义一个圆类，实现面积，周长的计算，定义一个圆柱类，通过继承圆类，实现圆柱的底面积，底面周长，并求出圆柱体的体积

初学写的不好，有问题希望大家指导，像大家学习。

c++的实现：（复习类）

#include <iostream>
    #include <cmath>
    #define PI 3.14159       // 宏定义π=3.14159
    using namespace std;
    
    class Circle
    {
    protected:
    	double R;
    	double circlearea,area; // 底圆周长和面积
    public:
    	Circle(double);
    	void Input();
    	void Circlearea();
    	void Area();
    	void Output();
    };
    
    Circle::Circle(double r)
    {
    	R=r;
    }
    
    void Circle::Input()
    {
    	cout<<"圆的半径: "<<endl;
    	cin>>R;
    }
    
    void Circle::Circlearea()
    {
    	circlearea=2*PI*R;
    }
    
    void Circle::Area()
    {
    	area=PI*R*R;
    }
    
    void Circle::Output()
    {
    	cout<<"圆的周长："<<circlearea<<endl;
    	cout<<"圆的面积："<<area<<endl;
    }
    
    class Cylinder:public Circle
    {
    public:
        Cylinder(double ,double );
    	void Input();
    	void Bulk();
    	void Output();
    protected:
    	double height,bulk; // 体积
    };
    
    Cylinder::Cylinder(double r,double h):Circle(r),height(h){}
    
    void Cylinder::Input()
    {
    	Circle::Input();
    	cout<<"以此圆为底的圆柱的高: ";
    	cin>>height;
    }
    
    void Cylinder::Bulk()
    {
    	bulk=PI*R*R*height;
    }
    
    void Cylinder::Output()
    {
    	cout<<"圆柱:"<<endl;
    	Circle::Output();
    	cout<<"圆柱体的体积："<<bulk<<endl;
    }
    
    int main()
    {
    	Circle x(2);
    	x.Circlearea();
    	x.Area();
    	x.Output();
    	Cylinder b(1,1);
    	b.Circlearea();
    	b.Area();
    	b.Bulk();
    	b.Output();
    	return 0;
    }

java的实现：（未修改版）

package Text1;
    
    public class Circle{
    		 
        protected double radius;
        
        public Circle(){//圆类
    		radius=0;
    	}
    		
    	public Circle(double radius) {
    		this.radius = radius;
    	}
    	
    	public double getRadius() {
    		return radius;
    	}
    	public void setRadius(double radius) {
    		this.radius = radius;
    	}
    	public double area(){
    		return 3.14*radius*radius;
    	}
    		
        }
    class Cyliinder extends Circle{//圆柱类继承圆类
    		
        protected double height;
        
    	public Cyliinder(){
    		height=0;
    	}
    		
    	public Cyliinder(double radius,double height) {
    	    super(radius);
    	    this.height = height;
    	}
    	public double getHeight() {
    	    return height;
    	}
    	public void setHeight(double height) {
    		this.height = height;
    	}
    		
    	public double volume(){
    		return area()*height;
    	}
    		
    	}
    
    public class aa{
    	public static void main(String[] args) {
    		
    	Circle c1=new Circle(1);
    	System.out.println("圆:");
    	//输出圆的半径
    	System.out.println(c1.getRadius());
    	//输出圆的面积
    	System.out.println(c1.area());	
    	
    	Cyliinder c2=new Cyliinder(3,5);
    	System.out.println("圆柱:");
    	
    	System.out.println(c2.getRadius());
    		//输出高
    	System.out.println(c2.getHeight());
    	   //输出面积
    	System.out.println(c2.area());
    		//输出体积
    	System.out.println(c2.volume());
    		}
    }

java代码（删改之后）:

![Center][]

package cn.demo;
    
    /**
    * @ClassName: Circle 
    * @Description: 圆的类 
    * @author myname
    * @date 2016-6-20 下午9:24:23 
    * @version 1.0
     */
    
    public class Circle
    {
    	/**半径*/ 
        protected double radius;
        
        public Circle()
        {
    		radius=0;
    	}
    		
    	public Circle(double radius) 
    	{
    		this.radius = radius;
    	}
    	
    	public double getRadius() 
    	{
    		return radius;
    	}
    	
    	public void setRadius(double radius)
    	{
    		this.radius = radius;
    	}
    	
    	public double area()
    	{
    		return 3.14*radius*radius;
    	}
    		
    }

package cn.demo;
    
    /**
    * @ClassName: Cyliinder 
    * @Description: 圆柱类
    * @author myname
    * @date 2016-6-20 下午9:25:37 
    * @version 1.0
     */
    
    public class Cyliinder extends Circle
    {
    	/**高*/
        private double height;
        
    	public Cyliinder()
    	{
    		height=0;
    	}
    		
    	public Cyliinder(double radius,double height)
    	{
    	    super(radius);
    	    this.height = height;
    	}
    	
    	public double getHeight() 
    	{
    	    return height;
    	}
    	
    	public void setHeight(double height) 
    	{
    		this.height = height;
    	}
    		
    	public double volume()
    	{
    		return area()*height;
    	}
    		
    }

package cn.test;
    
    import cn.demo.Circle;
    import cn.demo.Cyliinder;
    
    
    public class DemoTest 
    {
    	/**
    	 * @param <Circle> 
    	 *
    	 * @Title: main 
    	 * @Description: test
    	 * @param @param args    设定文件 
    	 * @return void    返回类型 
    	 * @throws 
    	 */
    	
    	public static void main(String[] args) 
    	{
    		Circle c1=new Circle(1);
    		System.out.println("圆:");
    		//输出圆的半径
    		System.out.println(c1.getRadius());
    		//输出圆的面积
    		System.out.println(c1.area());	
    		
    		Cyliinder c2=new Cyliinder(3,5);
    		System.out.println("圆柱:");
    		
    		System.out.println(c2.getRadius());
    			//输出高
    		System.out.println(c2.getHeight());
    		   //输出面积
    		System.out.println(c2.area());
    			//输出体积
    		System.out.println(c2.volume());
    	}
    
    }

[Center]: /images/20220721/89b2e2ec32d6460fa0451de728a3094b.png