国产AV永久无码精品一区二区

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.For beginners of weightlifting, as long as the sole is flat, hard and skid-proof. Avoid basketball shoes, high-top sneakers and shoes without shoelaces (SLIP ON).在被丈夫物化之后，莉亚·沙弗放弃了她的婚姻，陷入了一种注定的血缘关系，一个小邪教致力于结束厌恶女性的文化，并超越到一个超越星星的地方。算是因祸得福吧，也不枉自己一片苦心。Including the design and implementation of clinical and basic research, and the transformation of basic research results into clinical applications. At present MDT has become a set of macro medical diagnosis, treatment and management modes.