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Adapter mode of interface: When you don't want to implement all methods in an interface, you can create an abstract class Wrapper to implement all methods. When we write other classes, we can inherit the abstract class.神秘的外太空，出现了全新外星大反派！智羊羊与丽羊羊再次出现，喜羊羊妹妹首度亮相？全新的角色、发明、剧情，羊羊们这次该如何化解危机？围观众人都看呆了，场中一片寂静。During that time, Huang Weiping and Ding Rui often ran to funeral parlors and crematoria. They became friends with the mortician. It was also specially approved by the Shanghai Ministry of Civil Affairs to lie down in a real incinerator. For the first time, the incinerator in the crematorium "burned" the living.We would like to thank Jianping once more for providing us with this unique opportunity. We have learned greatly during the past few days, but it's now time to bring this experience to a convention.Invoker is the caller (commander), Receiver is the caller (soldier), MyCommand is the command, which implements the Command interface, holds the receiving object, and looks at the implementation code:The implementation scheme of this module mainly includes the two keywords of require and module, which allow a module to expose some interfaces to the outside world and import and use them by other modules.