Let us experience all the things by using a case circumstance. But in advance of that, let's speak about some OOP principles. @MarkusMeskanen: since the item is immutable, and if you mutated it set up you could possibly not specialise it within a subclass. ストラテジーとは？意味や使い方、ビジネスでの重要性と実践例を徹底解説 淘宝订单可以打开全部订单进行开电子发票，一共八个步骤就可以完... https://ddjayplotssonipat.fitness.blog/