Solution: Transforming Shape Area Calculation

abstract class Shape {
    public abstract double calculateArea();
}
class Rectangle extends Shape {
    private double width;
    private double height;
    public Rectangle(double width, double height) {
        this.width = width;
        this.height = height;
    }
    @Override
    public double calculateArea() {
        return width * height;
    }
}
class AreaCalculator {
    public double calculateTotalArea(Shape[] shapes) {
        double totalArea = 0;
        for (Shape shape : shapes) {
            totalArea += shape.calculateArea();
        }
        return totalArea;
    }
}
public class main {
    public static void main(String[] args) {
        Rectangle[] rectangles = new Rectangle[2];
        rectangles[0] = new Rectangle(5,10);
        rectangles[1] = new Rectangle(3,8);
        AreaCalculator calculator = new AreaCalculator();
        double totalArea = calculator.calculateTotalArea(rectangles);
        System.out.println("Total area: " + totalArea);
    }
}