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尚元王背脊升上一缕寒意：日本幕府出兵的话，想必大明也会相救吧。Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~For example, I opened a restaurant that normally can accommodate up to 30 people at the same time. You go straight into the restaurant, find a table and sit down to order, and you can eat immediately.卯正，郑家派人送来了早饭，刘蝉儿也醒来了，小葱和小草忙着伺候她喝药吃饭。