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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.[Investigation] Behind the Scenes of China's Crude Oil Spot Trading: Grey Crude Oil Futures Market Not Exiting(2) Navigation density, including the density of fishing boats or any other boats;Reporter Station: Will this award be reviewed regularly? Is 100,000 the highest award?As far as the sub-conclusions are concerned, especially the sub-conclusions (also known as keylinemessage) that directly support the main conclusion, the most important thing is to balance without bias.Resolving: Find the absolute path to the file;