Of the abstraction. The values for getRadius() or getCircumference() in the above mentioned instance could possibly be stored instantly, or they might be calculated, it does not make a difference to your caller; the setters may or may not have Unwanted side effects; it doesn't matter to your caller. Google https://propertyingurugram.in/ganga-realty-transforming-gurugrams-skyline-insights-from-joint-managing-director-vikas-garg/