Of this abstraction. The values for getRadius() or getCircumference() in the above mentioned example may be stored immediately, or they may be calculated, it would not subject for the caller; the setters may well or may not have Unwanted side effects; it won't make any difference to the caller. As https://propertyingurugram.in/dwarka-expressway-paving-the-path-for-real-estate-boom-and-connectivity-advancement/