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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.杨参议？胡巡抚？两边相对都是吃了一惊。2.2 Obtain the address of the system and/bin/sh by using the GDB command　　该SP剧将舞台设置在动画的20年后，讲述了在家庭聚餐机会减少，孩子们面临着社会严峻形势的情况下，海螺小姐为了寻回矶野家的笑容而四处奔走的故事。该剧通过当今时代的母亲和女儿的关系，讲述韩国目前面临的低生育率、高离婚率、不婚等年轻世代的问题。撰写《茶经》的陆羽为我们讲述了一个故事：宋朝时，在中国西南方，有公黑金茶族和母黑金族茶族烹制出各自性味不同的茶，日本人八木宗右卫门因无法忍受被公黑金族挑衅而让两族斗茶，最后以母黑金族被全面屠杀结束，只有一棵母黑金族茶的嫩芽被带去了日本而被保留下来。