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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.　　当他苏醒过来，才发现自己已被一群猿人团团包围，并被带往丛林更深处的猿人部落，与其它人类关在一起，里欧才惊觉这是个由猿人统治的星球，而人类已沦为次等种，打破人类一向自以为是宇宙中心的想法……这一刻，唐伯虎真是骚包到了极点，装逼到了极点。The recovered state is: egg如果回到那一天,你想去见谁?As the name implies, iterator pattern is to access objects in an aggregation sequentially. Generally speaking, it is very common in collections. If you are familiar with collection classes, it will be very easy to understand this pattern. This sentence contains two meanings: one is the object that needs to be traversed, that is, the aggregated object, and the other is the iterator object, which is used to traverse the aggregated object. Let's look at the diagram:郑家书房里，方五愤愤地说道，因为他府试也落榜了，正是那些人嘴里蠢到家的人。