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This is very understandable. The purpose of the command mode is to decouple the sender and executor of the command and separate the request from the execution. Students familiar with Struts should know that Struts is actually a technology that separates the request from the presentation, which inevitably involves the idea of the command mode!接着。很微小的一件事情，对历史都产生着莫大的影响。I follow the execution process of this small program: first, I 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 result, and print it out. This just verifies our thinking at the beginning.　　热血宣言：控诉世间的不公不义...等等！世纪之交，某新型“杀手锏”导弹武器研制成功。导弹部队总部将为该型号导弹武器筑巢的“世纪龙”龙头工程建设任务交给了某工程兵师大功团。担负施工任务的大功团突遇山体滑坡，8名战士被困在坑道内，生死未卜。在导弹部队总部观摩导弹发射的团长石万山被紧急召回参与指挥营救工作。导弹发射成功，8名战士也被安全救出。为保证工程建设任务的完成，导弹部队总部派女工程师林丹雁担任“龙头”工程的技术总监，工程兵师也委派副参谋长——“钻石王老五”郑浩任七星谷工程前指总指挥。俩人曾经都和石万山打过交道，有着微秒的私人关系和感情纠葛……