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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.The landlord has not found the piano score that is restricted for a long time.Printed board伙计很快点过钱，取了一只状元铃递给老童生，老童生再不理会任何人，提着风铃一溜小跑朝家奔去，生怕挂的比别人晚了。老爹言重了。931年，魔都“上海”。导演采用非线性叙事的手法，透过几个不同的章节，带着观众一步步拼凑出，藏在阿草影子背后的真相拼图…