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This principle means that there are no methods in each interface that subclasses cannot use but must implement. If not, the interface must be split. It is better to use multiple isolated interfaces than to use a single interface (an interface where multiple interface methods are assembled into one).夏阳的水情只是略微好些而已，相对于临晋关，这些的河水还是显得有些湍急让人禁不住的有些迟疑。1946年2月26日。 汽车制造商发生了226起事故。 在下雪天，在大宅天的路上，在饺子屋檐下的那个婴儿成了这所房子的孩子。 以及半身妹妹樱花的诞生，战争和父亲的远征始于小学，初恋...Analysis: It mainly lies in retaining the plus and minus signs. The result is NaN, but note that NaN is not equal to all values, including itself.心里越发觉得喜欢，很想下车跑回家。The world is very complicated, full of phenomena, facts and various viewpoints (insights, lies and deception). We need to extract the consistency behind them in order to quickly understand and understand the world. This consistency is the dimension in the classification. The classification of the three worlds is just to find a classification method for countries that we have not used before. The traditional classification of countries is based on geographical location (five continents), population (large and small countries) and development stage, while the three worlds are classified according to their relationship.