Of this abstraction. The values for getRadius() or getCircumference() in the above mentioned example might be saved directly, or they could be calculated, it does not make any difference to the caller; the setters may or might not have Unwanted effects; it does not make a difference towards the caller. https://propertyingurugram.in/elan-group-launches-rs-4000-cr-super-luxury-residential-project-at-dwarka-expressway/