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Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example:同名の漫画『GANTZ』を原作とする。http://www.gantz-movie.com/某个平凡的傍晚，大学生玄野计（二宫和也 饰）在电车站重逢初中时代的好友加藤胜（松山健一 饰）。为了救助一个跌落铁轨的男子，他们二人遭到电车的强烈撞击。然而转眼之间，他们便毫发无损地来到一间密闭的屋子内。这里还有另外七个男人以及一个巨大的黑色球体。根据黑球的指示，这群人需要穿上战服拿起武器去刺杀葱星人。有的人为了奖金投入了杀戮游戏，有的人为了生存而冷酷无情。生死关头，懦弱的阿计和善良的阿胜也不得不投入其中，而前方还有更多的考验等待着他们。此外，名为GANTZ的系统又隐藏着怎样的秘密？Stance's founding team was composed of five people. At first, they bought 2,000 pairs of socks of different brands and tried them on one by one. They had to change several pairs a day. Then everyone got together to talk about its material, which point they didn't like about this pair of socks, and to dig out the real demand of users for socks. As a result, they found that 80% polyester fiber and 20% cotton blended fabric can achieve the best humidity management effect.　　The year before last, there was a protest in Shanghai that did not work overtime. 40 lonely women held up signs to complain to their husbands:人家事后可没不要媳妇呢。