Of this abstraction. The values for getRadius() or getCircumference() in the above mentioned example may very well be saved specifically, or they may be calculated, it would not subject into the caller; the setters might or won't have Uncomfortable side effects; it won't subject on the caller. 近年来这方面的研究开发主要是围绕结构 、 合成 https://emaarurbanoasissector62gurgaon.blogspot.com/2025/07/m3m-st-andrews-at-scda-combines-modern.html