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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.1945年秋天，抗战全面胜利，驻鲁南临枣地区一千余人日军在沙沟向铁道游击队缴械投降，这是中国唯一接受日军投降的抗日武装。当刘洪等人尽情欢呼的时候，日军宪兵司令松尾，却利用引爆自杀的诡计隐藏下来，这个战争狂人要把所谓的“圣战”进行到底。眼下，老五已经落地了。　　恩星父的公司突然面临了破产危机，恩星父经受不住打击而过世，全部的财产被继母夺走，恩星和弟弟流落街头。偶然的机会恩星进入真诚食品公司，一番坎坷经历之后终于成功，并得到了属于自己的爱情。那无数次被正义的英雄打倒他们是在开发部工作的人，创造了命运之恶的怪人。In the 1980s, he personally caught an overseas spy. When he learned that another spy was still at large, he led a group of border guards to follow the direction of the spy's flight up the mountain. When the car could not drive, they walked. When the road was no longer available, they climbed the mountain. At last they came to a forbidden area frequented by wolves.