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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.View the v6 version of the image:1939年，冀中平原向太行山区的过渡地带，风铃渡的老百姓家家断粮，饥不择食。几名从北平来河北参加抗战、筹建兵工厂的年轻大学生，在八路军区小队护送下穿越日军封锁线，却被日军狙击，区小队几乎全军覆没。为了成功建立秘密小型兵工厂，制造炸药和地雷，支援八路军抗战，一步步重建起来的区小队在战火连天中磨炼，在生死抉择时成长。他们百折不挠、奋勇杀敌，用智慧和鲜血抵抗日寇，支援抗日，保卫人民。Form Validation亲们查一下，订阅满十元，就有一张免费评价票，只能投给本书，不投也浪费。Age: 21First, let's talk about scenario, and distribute the content according to the scene where users use the product. For example, users place orders for tickets in Cat's Eye movies, and after the completion, there are actually other needs for scenes.