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李敬文哭笑不得地看着自家娘亲，这么几十岁的人了，还是一如既往地天真烂漫，喜怒皆放在脸上。666666666666该剧讲述了一对夫妻离婚7年后在一场婚礼上作为新郎和婚礼主持人偶遇导致婚礼泡汤，又更倒霉地卷入到一起杀人案的故事。该剧以韩国1%的上流层举办结婚典礼的特级酒店为背景，讲述可疑的杀人事件后发生的故事。The best way to conform to the opening and closing principle is to provide an inherent interface, and then let all classes that may change implement the interface, allowing fixed interfaces to interact with related objects.I follow the execution process of this small program: first, take exp and "\ +" as parameters, call the calculation (String, String) method in the AbstractCalculator class, call split () of the same kind in the calculation (String, String), then call the calculation (int, int) method, enter the subclass from this method, after executing return num1 + num2, return the value to the AbstractCalculator class, assign it to the result, and print it out. It just verified our initial thinking.