Java-Programs/ShapeAreaCalculator.java at main · UsamaAli-PK/Java-Programs · GitHub

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import java.util.Scanner;

// Abstract base class Shape
abstract class Shape {
    abstract double calculateArea();
}

// Derived class Circle
class Circle extends Shape {
    private double radius;

    // Constructor
    public Circle(double radius) {
        this.radius = radius;
    }

    @Override
    double calculateArea() {
        return Math.PI * radius * radius;
    }
}

// Derived class Rectangle
class Rectangle extends Shape {
    private double length;
    private double width;

    // Constructor
    public Rectangle(double length, double width) {
        this.length = length;
        this.width = width;
    }

    @Override
    double calculateArea() {
        return length * width;
    }
}

// Derived class Triangle
class Triangle extends Shape {
    private double base;
    private double height;

    // Constructor
    public Triangle(double base, double height) {
        this.base = base;
        this.height = height;
    }

    @Override
    double calculateArea() {
        return 0.5 * base * height;
    }
}

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

        System.out.println(" ███████╗██╗  ██╗ █████╗ ██████╗ ███████╗     █████╗ ██████╗ ███████╗ █████╗ ");
        System.out.println(" ██╔════╝██║  ██║██╔══██╗██╔══██╗██╔════╝    ██╔══██╗██╔══██╗██╔════╝██╔══██╗");
        System.out.println(" ███████╗███████║███████║██████╔╝█████╗█████╗███████║██████╔╝█████╗  ███████║");
        System.out.println(" ╚════██║██╔══██║██╔══██║██╔═══╝ ██╔══╝╚════╝██╔══██║██╔══██╗██╔══╝  ██╔══██║");
        System.out.println(" ███████║██║  ██║██║  ██║██║     ███████╗    ██║  ██║██║  ██║███████╗██║  ██║");
        System.out.println(" ╚══════╝╚═╝  ╚═╝╚═╝  ╚═╝╚═╝     ╚══════╝    ╚═╝  ╚═╝╚═╝  ╚═╝╚══════╝╚═╝  ╚═╝");

        System.out.println(" ██████╗ █████╗ ██╗      ██████╗██╗   ██╗██╗      █████╗ ████████╗ ██████╗ ██████╗   ");
        System.out.println("██╔════╝██╔══██╗██║     ██╔════╝██║   ██║██║     ██╔══██╗╚══██╔══╝██╔═══██╗██╔══██╗");
        System.out.println("██║     ███████║██║     ██║     ██║   ██║██║     ███████║   ██║   ██║   ██║██████╔╝");
        System.out.println("██║     ██╔══██║██║     ██║     ██║   ██║██║     ██╔══██║   ██║   ██║   ██║██╔══██╗");
        System.out.println("╚██████╗██║  ██║███████╗╚██████╗╚██████╔╝███████╗██║  ██║   ██║   ╚██████╔╝██║  ██║");
        System.out.println(" ╚═════╝╚═╝  ╚═╝╚══════╝ ╚═════╝ ╚═════╝ ╚══════╝╚═╝  ╚═╝   ╚═╝    ╚═════╝ ╚═╝  ╚═╝");

        System.out.println("\nChoose a shape to calculate the area");
        System.out.println("1. Circle");
        System.out.println("2. Rectangle");
        System.out.println("3. Triangle");
        int choice = scanner.nextInt();

        Shape shape = null;

        switch (choice) {
            case 1:
                System.out.print("Enter the radius of the circle: ");
                double radius = scanner.nextDouble();
                shape = new Circle(radius);
                break;
            case 2:
                System.out.print("Enter the length of the rectangle: ");
                double length = scanner.nextDouble();
                System.out.print("Enter the width of the rectangle: ");
                double width = scanner.nextDouble();
                shape = new Rectangle(length, width);
                break;
            case 3:
                System.out.print("Enter the base of the triangle: ");
                double base = scanner.nextDouble();
                System.out.print("Enter the height of the triangle: ");
                double height = scanner.nextDouble();
                shape = new Triangle(base, height);
                break;
            default:
                System.out.println("Invalid choice!");
                System.exit(0);
        }

        System.out.println("The area is: " + shape.calculateArea());
        scanner.close();
    }
}