Find the error in this code snippet:

Find the error in this code snippet:

interface Shape {
    double area();
}

class Circle implements Shape {
    double radius;
    Circle(double r) { radius = r; }
    public double area() { return 3.14 * radius * radius; }
}

class Test {
    public static void main(String[] args) {
        Shape s = new Circle(5);
        System.out.println(s.radius);
    }
}