一个长方形类Rectangle,一个子类长方体类,计算周长，面积，体积

[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 len, double wi) {
		length = len;
		wide = wi;
	}
	public double getLength() {
		return length;
	}
	public double getWide() {
		return wide;
	}
	public double getPerimeter() {
		return 2*(length + wide);
	}
	public double getArea() {
		return length*wide;
	}
}
class Cuboid extends Rectangle{
	private double height;
	public Cuboid(double len, double wi, double hei) {
		super(len, wi);
		this.height = hei;
	}
	public double getPerimeter() {
		return 4*(super.getLength() + super.getWide() + height);
	}
	public double getArea() {
		return 2*(super.getLength()*super.getWide() + super.getLength()*height + super.getWide()*height);
	}
	public double getVolume() {
		return super.getLength()*super.getWide()*height;
	}
}