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3. Code: shy; Shy."The hotel is located on the side of Yalong Bay Central Square. It is divided into one area and two areas. The first area is older and the second area is newer. The decoration style is more conventional. The lobby is flanked by guest rooms with good scenery.这门亲断断做不成了，他想道。你想去，朕还不放心呢。3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.Understanding Factory Method Patterns: All Factory Method Patterns are used to create objects. The factory method pattern encapsulates the object creation process by letting subclasses decide what the created object is. The factory method pattern has the following roles: