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Through these two examples, we can see that everyone has different understanding of the division of operations, because what I have done has not changed much, but it is different in the eyes of different people, because everyone has different understanding of the target products.So the result is? 21　　汉斯在屋顶上装了炸药，企图把人质和联邦调查局的营救直升机一同炸掉。麦克莱恩与搜寻他的匪徒之间进行了一场苦斗。而此时新闻记者的卑鄙行为更使霍莉暴露了身份，处境更加危险。Can be instantiated and instantiated once.尹旭高坐在上，气势不凡，楚汉两国相继被越军打败，越王尹旭的身份和影响力也发生了很大变化。当然，将军请放心，属下定然不负所托。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.