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要是还没上战场，就在路上就被来历不明的人杀了，她将如何对他们的家人交代？回过头，只见十几个军士押着三个五花大绑的汉子推搡过来，顿时眼睛都红了，厉声喝问：怎么回事？一个老军回道：玄龟他们从蛇盘谷探查回来，碰见这几个人，他们问也不问一声，就对玄龟几人下狠手。　　就这样，瑞恩贸然闯进了这个陌生的富人世界，却被他的同类排斥在心门之外……汪滶越听越激动，这挺有意思啊。"Persimmon Dyed Blue"宴席尚未开始。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.The observer pattern defines a one-to-many dependency, allowing multiple observer objects to listen to a topic object at the same time.