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Composite Reuse Principle (CRP) is to use some existing objects in a new object to make it part of the new object. New objects reuse used functions by delegating to these objects. In short, it is necessary to use synthesis/aggregation as much as possible and not inheritance as much as possible.Therefore, although we use the service iptables start to start the iptables "service", in fact, iptables does not have a daemon, so it is not a real service, but a function provided by the kernel.尹旭和李斯等人与云青山相视一笑，或许这就叫做相逢一笑泯恩仇吧。The following is an example of rewriting electric lights to show this lighter approach: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.FX已宣布续订旗下喜剧《更美好的事》第二季。