Let us go through every little thing by using a circumstance situation. But before that, let us take a look at some OOP principles. @MarkusMeskanen: since the object is immutable, and if you mutated it in position you could not specialise it inside a subclass. 「フェイク」と「イミテーション」は、どちらも「偽物」という意味がありますが、「フェイク」はやや悪意を含んで使われることが多いで... https://gurgaonnewproject.sport.blog/