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今日这一闹，他忽然觉得：儿子若再跟老头儿们混在一处，也不知将来会长成什么样子，一点儿少年天真也没有。胡家大太太和二太太被骂懵了。自己不过才二十出头，正是年富力强的时候，对方却已经到了花甲之年，就这样都占不到一丝便宜。B) It is suggested to start from a simple scene and discover or design a certain pattern by yourself. From this, you can understand how the model solves the problem. In this way, the model becomes your own thing, and you will not have the problem that it is easier said than done. All design patterns are just the application of basic principles and concepts in specific occasions. You may not know the name of a design pattern, but you know all its advantages, disadvantages, variants and applications. Seeing mountains is not mountains, seeing water is not water.该剧讲述了渝州城永安当的小伙计景天（胡歌饰）和杨幂饰演的唐门大小姐雪见的故事。受到两人随身玉佩的彼此吸引，他们二人“热闹而又尴尬”的相识了，成了一对欢喜冤家。其实雪见和景天正是彼此的有缘人，而他们都来历不凡，身藏几世的秘密。随着雪见家族的剧变，二人阴差阳错的步入了江湖的血雨腥风之中，并结识了龙葵、紫萱和长卿等，等待他们的是更加惊险的前程和重大的责任。Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.