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(5) Number, position and dynamics of ships detected by radar;Through the configuration file my.cnfNote: When adding rules, the order of the rules is very important两人的心逐渐靠近，但也逐渐发现了对方身上的秘密。原来自己的父亲张海天竟也是董宁书的父亲。当年张海天抛弃了董宁书母女，两家就此结怨。在张希达的努力下，发现了多年前的尘封真相，解除两家的误会，两家人就此和解，而两人也并非亲姐弟，有情人终成眷属。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.