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Https://www.jiemian.com/article/1919701.html3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.年少的夏木（吴亦凡饰）因亲眼目睹母亲自杀而变得自我封闭，直到16岁的舒雅望（卢杉饰）出现，用温暖关怀渐渐融化夏木的心。雅望青梅竹马的恋人唐小天（韩庚 饰）高中毕业后进入军校，不料就在唐小天就读军校期间，曲蔚然（周元饰）出现并摧毁了雅望的生活，也让夏木在绝望之下做出疯狂行径……夏木、雅望、唐小天，他们还能找回曾经的那个天堂吗？明教教众大多都是穷苦中人，他们的志向是对抗朝廷，推翻暴政，拯救世人Link to this article: Scratch2.0 Programming Tutorial Section 6: Event ModuleThe code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.