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How to learn efficiently? I think we need good methods, insist on deliberate practice, ensure sufficient intensity, and effective coaches to provide feedback for learning. This "Deliberate Practice" provides you with effective guidelines.Gracia NilbasOne 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.By 64 bytes, the SYN packet has been populated and is ready to start transmission. The attack packet is very small, far less than 1500 bytes of the maximum transmission unit (MTU), so it will not be fragmented. So these data packets are like cans on the production line, one packet after another tightly packed together for transmission? In fact, this is not the case.用官场的脏脏手段侵蚀耿直的海盗社交场，杨长帆也觉得自己很肮脏。太精彩了。