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　　雁山老林，一场伏击日本人粮食的战斗打响，为此，县大队筹谋规划，志在必得。就在计划顺利实施的时候，谁料想，雁山老林的土匪“林中王”林振海的队伍突然杀出，抢得粮食。此事在县大队引起了轩然大波。县大队二队长李双枪认定县大队出了汉奸，要不林振海不可能顺利地从自己手里抢走粮食。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.21世纪特种部队人员项少龙（古天乐 饰）决意要参加穿梭时空的研究，是为了要挽回自己的爱情。但由于时光机的数据出错，把少龙带到了战国时期。Analysis:After the founding of the People's Republic of China in 1949, most countries did not care for us, so they had to fall into the arms of Big Brother Soviet Union and learn from the Soviet model. In the later practice, China's diplomacy slowly groped and accumulated more experience and lessons. It has established diplomatic relations with many Western countries. With the help of poor brothers in Asia, Africa and Latin America, it passed Resolution 2758 at the 26th session of the UN General Assembly in 1971, restoring China's legal seat in the UN, and normalizing diplomatic relations with Japan in 1972.