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In fact, each design pattern is a very important idea, which looks very familiar. In fact, it is because what we have learned is involved. Although sometimes we don't know it, it is actually reflected everywhere in Java's own design, such as AWT, JDBC, collection class, IO pipeline or Web framework, in which design patterns are everywhere. Because of our limited space, it is difficult to talk about every design pattern in great detail, but I will try my best to write down the meaning clearly in the limited space and space so as to make everyone understand better. If there is no accident in this chapter, it should be the last talk of the design pattern. First of all, it should be the figure at the beginning of the previous article:B, build a surface parallel to the curved surface, fill the required material on the new surface, right-click Map-Projection on the new surface, then use the straw tool to suck the picture as the material, and then fill it on the curved surface.Https://www.jiemian.com/article/1919701.htmlTemple of HeavenThen we went to the main road and left separately. Fu Gang and I took a taxi directly to Pingyi County. We met at 8 o'clock in the morning in Pingyi County. We took a bus to Jining together. We bought a suit of clothes and shoes in Jining and threw away the clothes and shoes we wore when committing the crime. We were going to go out and hide, but you caught us.Using monomer mode can make the code organization more consistent and make the code easy to read and maintain.Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example: