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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.双方交错而过的时候。The picture shows Mr. Sun (second from right) leading the team leader (first from right) and vice-captain (first from left) to take a picture with the practice unit.Barbie's younger sister Chelsea is trying to celebrate her 7th birthday but her birthday is skipped due to the international date line.The reporter asked whether the two sides talked about possible US inspections of North Korea's nuclear facilities at the summit with North Korean leader Kim Jong Un.杨长帆转身要走，真不要姑娘？……毛海峰看着杨长帆，纠结许久过后，才弱弱问道，有没有年轻貌美的男子？……也不用太过貌美，不比你差就可以了。The current boss, she thinks that I am not an editor and do not produce articles with content information, then I am the user operator.