PlasticCost.java

import java.util.Scanner;

// 2D Class
class Plastic2D {
    double length, breadth;
    int cost_per_sqft = 40;

    void getDimensions(double l, double b) {
        length = l;
        breadth = b;
    }

    double calculateCost() {
        double area = length * breadth;
        return area * cost_per_sqft;
    }
}

// 3D Class inheriting from 2D
class Plastic3D extends Plastic2D {
    double height;
    final int cost_per_sqft= 60;

    void getDimensions(double l, double b, double h) {
        length = l;
        breadth = b;
        height = h;
    }

    double calculateCost() {
        double volume = length * breadth * height;
        return volume * cost_per_sqft;
    }
}

// Main class
public class PlasticCost {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter 1 for 2D Sheet or 2 for 3D Box:");
        int choice = sc.nextInt();

        if (choice == 1) {
            Plastic2D sheet = new Plastic2D();
            System.out.println("Enter length and breadth:");
            double l = sc.nextDouble();
            double b = sc.nextDouble();

            sheet.getDimensions(l, b);
            System.out.println("Cost of Plastic Sheet = Rs " + sheet.calculateCost());
        }
        else if (choice == 2) {
            Plastic3D box = new Plastic3D();
            System.out.println("Enter length, breadth and height:");
            double l = sc.nextDouble();
            double b = sc.nextDouble();
            double h = sc.nextDouble();

            box.getDimensions(l, b, h);
            System.out.println("Cost of Plastic Box = Rs " + box.calculateCost());
        }
        else {
            System.out.println("Invalid choice");
        }

        sc.close();
    }
}