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爱丽丝有些可怜兮兮的看着陈启，说道：我人在异乡，漂泊在外，无依无靠……那，要不你就在我们这里，凑合过个年……陈启刚说完，就听爱丽丝说道：就等你这句话。然而，板栗的郁闷还没结束。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.　旧上海滩，十里洋场的繁华掩盖不了背后你死我活的江湖厮杀。Case: For example, for an important work at different stages, due to its importance and time constraints, the Company specially held a special coordination meeting to clarify the work that various departments need to cooperate in the implementation, and also stated that various departments should fully cooperate, and sometimes even directly authorize the responsible persons of the departments concerned to have special rights to coordinate the overall work. However, when cooperation is often needed, the situation will not be as fully coordinated as stated at the meeting. Dispatching a person needs to ask for instructions from the person's department head. After contacting the department head, the department head also needs to ask for instructions from the competent leader. If the leader arranges, it will be implemented.The dispute over questions between the two sessions is no less than the actress winning the C position.Free throw: