Of this abstraction. The values for getRadius() or getCircumference() in the above mentioned illustration may very well be stored instantly, or they could be calculated, it isn't going to subject for the caller; the setters may well or might not have Unwanted effects; it would not issue on the caller. https://medium.com/@CentralPark104/a-new-benchmark-in-futuristic-urban-living-smartworld-one-dxp-sector-113-782bf5e5abe7