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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.***大苞谷虽然精明，到底不通政事，因此一时没反应过来，或者说，他只想到做生意上去了，便答道：那好啊。Article 14 Fire safety assessment institutions with first-class qualifications may practice nationwide. Other fire-fighting technical service institutions may practice within the scope of the provinces, autonomous regions and municipalities directly under the Central Government where the license is located.　　然而威廉他们很快发现，此次任务绝非如此简单，他们前行的路上充满凶险……《谢文东 第二季》再掀江湖风云，看东哥如何愈战愈强，带领文东会登上江湖顶端……这孩子委实令人捉摸不透，他不是应该告诉他家在哪里、家中有什么人，然后求他送他回家吗？怎么却跟守着一个秘密似的不说呢？有一天，他终于忍不住了，命令黑汉子将玉米绑在凳子上，用藤条猛抽他后背和屁股，他则在暗中观看。