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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 purpose and expected results of MDT discussions should be clear.Recently, I was practicing single pass. I met Tank who could not run directly in the picture with the time mechanism. It was very uncomfortable without fire on my hand. I once walked around it for ten minutes before I died (I was not hit by it). So I wanted to ask what was the specific condition for walking around Tank and how to walk around it as quickly as possible. I was really tired of walking around for ten minutes.送了些进宫，也就是个意思，谁知皇上和太后吃了都说好，又特特派人来要。For example, in the semiconductor industry, Li Qiang has on many occasions asked Shanghai authorities to attach importance to the development of integrated circuits and strive to make new breakthroughs as soon as possible on the basis of the existing ones. "The more areas that reflect the country's competitiveness, the more Shanghai will take the lead in planning and focusing on tackling tough problems."一统草原，打败东胡这些还不足够，打败南边的中原人，天下无敌才是最好的明证。The code in the fourth step has some changes, putting the logical behavior corresponding to the state in the Upload class: