134 - Shape类-3

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本文介绍了一个关于形状类的编程实例，通过将Shape类抽象化，并实现其子类如正方形、长方形和圆形，展示了如何计算这些形状的周长和面积。代码示例使用了Java语言。

134 - Shape类-3

Time Limit: 1000 Memory Limit: 65535
Submit: 429 Solved: 265

Description

修改题目133，将Shape类改为抽象类

Input

正方形类的边长
长方形类的长宽
圆类的半径

Output

正方形的周长、面积
长方形的周长、面积
圆形的周长、面积

Sample Input

1
1 2
2

Sample Output

4.00 1.00
6.00 2.00
12.57 12.57

import java.util.Scanner;
public class Main{
    public static void main(String[] args) 
    {
    	Shape s1,s2,s3;
         Scanner scan = new Scanner(System.in);      
         double length = scan.nextDouble();
         s1 = new Square(length);
         System.out.printf("%.2f ",s1.getPerimeter());
         System.out.printf("%.2f\n",s1.getArea());
 
         length = scan.nextDouble();
         double wide = scan.nextDouble();
         s2 = new Rectangle(length,wide);
         System.out.printf("%.2f ",s2.getPerimeter());
         System.out.printf("%.2f\n",s2.getArea());
 
         double radius = scan.nextDouble();
         s3 = new Circle(radius);
         System.out.printf("%.2f ",s3.getPerimeter());
         System.out.printf("%.2f\n",s3.getArea());
 
         scan.close(); 
    }
}
abstract class Shape
{
	public abstract double getPerimeter();
	public abstract double getArea();
}
class Square extends Shape
{
	double length;
	public Square(double length)
	{
		this.length = length;
	}
	@Override
	public double getPerimeter()
	{
		return 4 * length;
	}
	@Override
	public double getArea()
	{
		return length * length;
	}
}
class Rectangle extends Square
{
	double width;
	public Rectangle(double length,double width)
	{
		super(length);
		this.width = width;
	}
	@Override
    public double getArea() {
        return length*width;
    }
 
    @Override
    public double getPerimeter() {
        return 2*(length+width);
    }
}
class Circle extends Shape
{
	double r;
	public Circle(double r)
	{
		this.r = r;
	}
	@Override
	public double getArea() 
	{
        return Math.PI * r * r;
    }
    @Override
    public double getPerimeter() 
    {
        return 2 * Math.PI * r;
    }
}