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The factory class mode provides a mode to create a single class, while the builder mode is to centralize and manage various products to create composite objects. The so-called composite objects refer to a class with different attributes. In fact, the builder mode is obtained by combining the previous abstract factory mode with the final Test. Let's look at the code:听了郑氏一番话，张槐自己也心思千回百转。铳，还是得兵士来开，我没资格。顾涧听了暗暗心惊，又感叹不已。Second, I always try to find a perfect investment method, not aware of the necessity of gain and loss, so I glance left and right to be swayed by considerations of gain and loss. The first kind of people become paranoid and criticize the market for posing as truth when they are not satisfied. The second kind of people become swing and can never be firm once.2 testersSome people will think that people with type B blood are very mysterious. They usually live in seclusion and see the head but not the tail. When they want to talk to him, they can't find anyone. When they don't look for him, they will suddenly appear again. Now there are some girls who just like this unique temperament, which will attract girls to be more interested in them and want to know more about them.