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30. It is suggested that the company organize some middle-level managers to expand their training in the next step, change their ideas, develop their ideas and improve their management ability. (urgent)Copyright? Copyright 2002-2019 www.qidian.com All Rights Reserved Shanghai Xuanting Entertainment Information Technology Co., Ltd.山芋和红椒无辜挨骂。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.Resolution:In many fields, the road to excellence is not the result of accurate calculation of time, but vague and ambiguous. No simple model leads to greatness.