Of the abstraction. The values for getRadius() or getCircumference() in the above mentioned illustration can be saved directly, or they could be calculated, it won't make any difference to the caller; the setters may or might not have side effects; it does not make a difference on the caller. @Jenix https://propertyingurugram.in/independent-foors-driving-the-growth-of-real-estate-in-delhi-ncr/