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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.TVB台庆剧由王浩信、唐诗咏、张曦雯等主演《解决师》接捧《金宵大厦》播出，今年TVB的三部台庆剧之一。一场流星雨降临在盖亚星球，全球居民见证了百年难得一见的天象奇观，但随后一场突然爆发的神秘感染性疾病席卷而来，居民被感染后丧失理智，具有强烈攻击性，身上散发类似柚子花的香气，幸存者伯尼试图拯救星球Earlier this year, a blackmail software called "WannaCry" began to attack the Internet, from Chinese universities to British hospitals. In April this year, IDT, a Newark, New Jersey-based telecommunications company, suffered a similar attack, which was discovered by Goran Ben-Oni, the company's global chief operating officer. As Ben Oni said in an interview with the New York Times, he immediately realized that this blackmail software attack is different from other attacks against companies. It not only steals the information in the databases it infiltrates, but also steals the information needed to access these databases. This kind of attack means that hackers can not only obtain this information quietly, but also continuously monitor who accesses this information.武侠文化必会因为紫月剑而繁荣。白色道袍，白发苍苍，相貌普通，眼神慈悲……冥河教祖展现出来的形象，让杨舟惊讶不已。