Of this abstraction. The values for getRadius() or getCircumference() in the above mentioned case in point might be saved directly, or they might be calculated, it won't make a difference to the caller; the setters may or won't have Unwanted effects; it does not matter on the caller. Here is https://propertyingurugram.in/oberoi-realty-acquires-14-8-acre-in-gurugram-for-rs-597-crore/