7-1 sdut-oop-5 计算长方体和四棱锥的表面积和体积（类的继承） (10分)

import java.util.Scanner;
 
//声明类Demo01
public class Demo01 {
    //主方法，为程序的入口，运行程序时自动执行main方法
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            //每行读入三个数
            double l = sc.nextDouble();
            double h = sc.nextDouble();
            double z = sc.nextDouble();
            //构造长方体对象
            Cubic cubic = new Cubic(l,h,z);
            //构造四棱锥对象
            Pyramid pyramid = new Pyramid(l,h,z);
            //格式化数据
            String area1 = String.format("%.2f",cubic.area());
            String volumn1 = String.format("%.2f",cubic.volumn());
            String area2 = String.format("%.2f",pyramid.area());
            String volumn2 = String.format("%.2f",pyramid.volumn());
            System.out.println(area1+" "+volumn1+" "+area2+" "+volumn2);
        }
    }
}
//父类
class Rect{
    double l;
    double h;
    double z;
    public Rect(double l,double h,double z){
        if(l>0&&h>0&&z>0){
            this.l = l;
            this.h = h;
            this.z = z;
        }
    }
    //计算长方形底面积周长
    public double length(){
        return 2*(l+h);
    }
    //长方形底面面积
    public double area(){
        return 1*h;
    }
}
 
/*
长方体类
*/
 
class Cubic extends Rect{
    public Cubic(double l,double h,double z){
        super(l,h,z);
    }
    //长方体表面积，重写父类方法
    public double area(){
        return 2*super.area()+length()*z;
    }
    //长方体体积，子类新增方法
    public double volumn(){
        return super.area()*z;
    }
}
//四棱锥
class Pyramid extends Rect{
    public Pyramid(double l,double h,double z){
        super(l,h,z);
    }
    //四棱锥表面积，重写父类方法
    public double area(){
        return super.area()
                + l*Math.sqrt(z*z + h*h/4)
                + h*Math.sqrt(z*z + l*l/4);
    }
    //四棱锥体积，子类新增方法
    public double volumn(){
        return super.area()*z/3;
    }
}