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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."Charming New Zealand" Episode I Colorful CountryFreya's role is seriously underestimated."Is there any difference between their tooth shape and the canine teeth of ordinary carnivores?" I cut in a question.Here is the second parameter that is invoked on the first parameter.为了多看东方姑娘一眼，我一定要去电影院，一直看到电影下架。So this ford's second attack is