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// Step 1: Create the Shape interface
public interface Shape {
    double calculateArea();
}

// Step 2: Implement the RectangleAdapter class
public class RectangleAdapter implements Shape {
    private Square square;

    public RectangleAdapter(Square square) {
        this.square = square;
    }

    @Override
    public double calculateArea() {
        // Calculate the area of a rectangle by using the square's side length as both the length and width
        double sideLength = square.getSideLength();
        return sideLength * sideLength;
    }
}

// Existing Square class
public class Square {
    private double sideLength;

    public Square(double sideLength) {
        this.sideLength = sideLength;
    }

    public double getSideLength() {
        return sideLength;
    }

    public double calculateArea() {
        return sideLength * sideLength;
    }
}

// Main application
public class Main {
    public static void main(String[] args) {
        // Create a Square object
        Square square = new Square(5); // Assume a side length of 5

        // Create a RectangleAdapter object, adapting the Square to work with rectangles
        RectangleAdapter rectangleAdapter = new RectangleAdapter(square);

        // Calculate the area of the square using the adapter
        double squareArea = square.calculateArea();
        System.out.println("Area of the square: " + squareArea);

        // Calculate the area of a rectangle using the same adapter
        double rectangleArea = rectangleAdapter.calculateArea();
        System.out.println("Area of the rectangle: " + rectangleArea);
    }
}