Of this abstraction. The values for getRadius() or getCircumference() in the above case in point may be stored specifically, or they may be calculated, it doesn't matter towards the caller; the setters may or may not have Negative effects; it isn't going to make a difference for the caller. See https://propertyingurugram.in/trevoc-targets-rs-1000-crore-revenue-from-gurgaon-project/