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One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.白果道：看爹说的。没有达到既定的目标，散尽万贯家财，保的平安无事。A. Speed skatingEncouraged Hero Anger: When the health is below 10%, [Skill Damage] +90%.As a result, her daughter got polio and her leg was lame. Borrowed tens of thousands of yuan to cure the leg, but the result was still unable to recover. Every time I see her, my heart hurts. "Just because her parents wanted to save a little money, this sister was delayed all her life."