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The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.The fourth: singleInstanceCole, an aspiring twentysomething screenwriter, decides to write his most ambitious script to date by plotting out a whimsical, atmospheric, rom-com relationship with the daughter of his screenwriting idol, all in hopes of meeting her legendary father and getting a leg up in showbiz.民国初期。江南古镇陶家大院出了一件怪事，后院古井突然冒出绿水，伴着浓浓的腥气。大院里的人个个胆战心惊，这可不是什么好兆头。谁都知道，过去犯了家法家规的陶家主仆，有好几个被扔进这口井里。大太太在井边敲山震虎，旁敲侧击。这时，在上海做生意六年多没回过家的陶老爷家书到了，信上说他的六十寿辰要在家中过。这消息让所有人惊恐大太太掐指一算，二天后就是老爷生日，于是，陶家上下忙成一团。除了忙着迎接老爷和准备宴，更忙着掩盖这六年多的是是非非……玉米就抱在木头中间，顺水往下漂，小灰也跟先前一样，沿着河边在树林子里钻。This case is terrible. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . First of all, it will affect the good mood of the landlord after work.