Shapes Interface

public interface Shape
{
    //calculates and returns the area of the shape
    public abstract double getArea();

    //calculates and returns the perimeter of the shape
    public abstract double getPerimeter();

    //returns true if the area of the current shape is bigger than the
    //area of the otherShape, otherwise returns false.
    public abstract boolean hasBiggerArea(Shape otherShape);

    //returns true if the perimeter of the current shape is bigger than
    //the perimeter of the otherShape, otherwise returns false.
    public abstract boolean hasBiggerPerimeter(Shape otherShape);
}