Of the abstraction. The values for getRadius() or getCircumference() in the above mentioned instance could be saved immediately, or they may be calculated, it won't make any difference into the caller; the setters may or might not have Uncomfortable side effects; it does not make a difference to the caller. https://propertyingurugram.in/luxury-real-estate-developer-central-park-acquires-10-acre-land-from-bptp-at-rs-100-crore/