国产成人综合久久精品_国产成人综合久久精品

Slow POST AttackFind the learning community: Because a large amount of knowledge exists in the practice of the learning community, not in books, effective learning is not to close the door and practice hard, but to find your own learning group. For example, programmers practice programming on websites like GitHub.生死成败就看天意了，随即吩咐道：范紫，想办法秘密送彩儿出去。戚继光闭门不见，戚夫人倒是出来了。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.