形状类，正方形类，长方形类，圆类，周长面积

[java]代码库

import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
         Scanner scan = new Scanner(System.in);      
   
         double length = scan.nextDouble();
         double wide = scan.nextDouble();
         Rectangle r = new Rectangle(length,wide);
         System.out.printf("%.2f ",r.getPerimeter());
         System.out.printf("%.2f",r.getArea());
System.out.println();
         length = scan.nextDouble();
         wide = scan.nextDouble();
         double height = scan.nextDouble();
         Cuboid  c = new Cuboid (length, wide, height);
         System.out.printf("%.2f ",c.getPerimeter());
         System.out.printf("%.2f ",c.getArea());
         System.out.printf("%.2f",c.getVolume());

         scan.close(); 
    }
}
class Rectangle
{
	private double length;
	private double wide;
	public Rectangle(double c, double k)
	{
		length = c;
		wide = k;
	}
	public double getPerimeter()
	{
		return (length+wide)*2;
	}
	public double getArea()
	{
		return length*wide;
	}
	public double getLength()
	{
		return length;
	}
	public double getWide()
	{
		return wide;
	}
}
class Cuboid extends Rectangle
{
	private double height;
	public Cuboid(double c, double k, double g)
	{
        super(c,k);
		height = g;
	}
	public double getPerimeter()
	{
		return (super.getLength() + super.getWide() + height)*4;
	}
	public double getArea()
	{
		return (super.getLength()*super.getWide() + super.getLength()*height + super.getWide()*height)*2;
	}
	public double getVolume()
	{
		return super.getLength()*super.getWide()*height;
	}
}