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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.平日里只不过是做些训练新兵的事情，也着实闲得无聊。Article 53 If a fire control technical service institution and its employees are not satisfied with the specific administrative acts made by the fire control institution of the public security organ in the supervision and administration of fire control technical services, they may apply for administrative reconsideration or bring an administrative lawsuit according to law.At the right time, use the right tools to carry out reasonable attacks.The second paragraph of Article 23 of the Law on the Protection of Women's Rights and Interests stipulates that when employing female employees, each unit shall sign a labor (employment) contract or service agreement with them in accordance with the law. The labor (employment) contract or service agreement shall not stipulate any restriction on the marriage and childbirth of female employees.6. Delete Events