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Subject sub = new MySubject ();利用河水这些天然资源，远比自己动手的好多。轮到杨长帆发问了BIM technology has the characteristics of visualization. In bidding, BIM technology software is applied to create subway station model, color rendering and animation, which can intuitively display the design effect of subway station and solve the problem of inconvenient understanding for owners.短片中两人饰演的一对男女面对面的交流越来越少，很多事情都会通过微博来交流，甚至连吵架都通过微博完成。王夫人不相信道：这分明就是他干的。The code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.