Cannot debug this code !!!

public interface MyComparable {
    int compareTo(Object obj);
}

public class Rectangle {
    public double width;
    public double length;

    public Rectangle(double w, double l)
    {
        width = w;
        length = l;
    }

    public double area()
    {
        return length*width;
    }
}

public class Circle implements MyComparable {
    private double radius;
    public Circle ( double r)
    {
        radius = r;
    }
    public double area()

    {
        return 3.1416*radius*radius;
    }

    public int compareTo(Object obj)
    {
        if (obj instanceof Rectangle)
        {

            Rectangle rec = (Rectangle)obj;
            if ( this.area() < rec.area())
                {
                    return -1;
                }
            else
                if ( this.area() > rec.area())
                    {
                        return 1;
                    }
                else
                    {
                        return 0;
                    }
        }

        if (obj instanceof Circle)
        {
            Circle cir = (Circle)obj;
            if ( this.area() < cir.area())
                {
                    return -1;
                }
            else if ( this.area() > cir.area())
                {
                    return 1;
                }
                else
                {
                    return 0;
                }
        }
    }
}

public class TestComparable {

    public static void main(String[] args) {
        Circle cir = new Circle(4.5);
        Rectangle rec = new Rectangle(3,4);

        int res = -2;

        res = cir.compareTo(rec);
        System.out.printf("The result is %d", res);

    }

}

I get an error message :

Exception in thread "main" java.lang.Error: Unresolved compilation
problem:
    This method must return a result of type int

    at Circle.compareTo(Circle.java:14)
    at TestComparable.main(TestComparable.java:10)

Can you help ??

Thanks,
Ankur