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1. Creator: FactoryPizzaStore as defined above. It is an abstract class, which defines the method of creating objects. This method is an abstract method, and the specific process of creating objects is implemented by its subclasses. This abstract class usually relies on an abstract Product (another role in the factory method pattern) class. These abstract products are made by subclasses, and the creators do not care what kind of products are made.B) Use the tool BlueJ. The biggest advantage of BlueJ is that it provides a simple class diagram. As I did in the concise design pattern Java, I seldom draw class diagrams specifically, but take screenshots in BlueJ. When students write demonstration programs on the computer, they often look at his class diagram first to judge whether his program is correct or not, and then look at the source code when necessary."Because the artillery suddenly 'dumb fire', Later, it was said that it was the same as position 169, because the ammunition consumption was too large and too many shots would be supplied for a while. It was not wrong to say so, because at the peak of the attack, the number of the two strange things released by the Vietnamese army below was too large to count. Have you ever seen ants crossing the river? That's what it feels like, If they are piled together, The density is almost a "ball", So in this case, The firepower of the artillery group is especially strong, Ammunition consumption far exceeded previous expectations, After all, no one expected to meet such a thing at that time, We didn't know how to describe it when we sent back messages on walkie-talkies at the front line. Anyway, it just said that the number of enemies was very large. Hit them hard, It was also the most intensive shelling I have ever seen. In the blink of an eye, It is normal to drop 4-6 shells on an area of about one square meter or even at the same time. The entire position 142 trembled under the shelling, At last, I felt that the ground under my feet would be overturned. Now think about it. If it weren't for the artillery comrades' hard support for us, the dozen or so people and the guys in our hands at that time could not withstand the attack of so many strange things. If they were called to rush up, they would have to tear us up and chew us up.故事发生在上世纪四十年代末五十年代初，新疆和平解放前后。在贫穷落后的南疆乡村，美丽善良的维吾尔少女阿娜尔罕与纯朴勇敢的小伙子库尔班彼此爱慕。横行乡里的大地主乌斯曼伯克，为了向本地区的最高统治者伊明专员邀功献媚，打算把阿娜尔罕献给伊明做小妾。阿娜尔罕不愿屈从，却遭致乌斯曼的残酷迫害，家破人亡，流离失所，被迫和心爱的库尔班逃往茫茫的沙漠，寻求幸福自由。解放军进军新疆，给在生死线上苦苦挣扎的劳苦大众们带来了翻身做主人的希望。但是以伊明专员为首的旧制度恶势力集团，不甘心失去自己的权势地位，他们勾结以玛莎督察为代表的外国势力，负隅顽抗，妄图推翻新生的人民政权。在解放军、工作队的坚强带领下，阿娜尔罕、库尔班和乡亲们，同曾经不可一世的压迫者进行了一次次的斗争，用热情、汗水甚至鲜血，捍卫人民政权，迎来崭新的生活和命运。I follow the execution process of this small program: first, I take exp and "\ +" as parameters, call the calculation (String, String) method in the AbstractCalculator class, call split () of the same kind in the calculation (String, String), then call the calculation (int, int) method, enter the subclass from this method, after executing return num1 + num2, return the value to the AbstractCalculator class, assign it to result, and print it out. This just verifies our thinking at the beginning.