Of this abstraction. The values for getRadius() or getCircumference() in the above instance can be saved directly, or they could be calculated, it doesn't make a difference towards the caller; the setters may possibly or might not have Unwanted side effects; it would not matter to your caller. @Jenix In https://propertyingurugram.in/cci-group-to-invest-227-crore-to-develop-9-5-lakh-sq-ft-of-warehousing-in-gurugram/