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爱与遗憾的套路，但是又包含笑中带泪，很治愈。《明日传奇第三季》（Legends of Tomorrow Season 3，又名：DC's Legends of Tomorrow Season 3）是由CW电视台和DC漫画公司联合摄制的超级英雄电视剧，是美剧《明日传奇》系列的第三季。很多人都不禁想，陈启到底是怎样一个人？下次他是否还是会创造出奇迹？……就在外界对《笑傲江湖之东方不败》惊叹不已，对天启惊叹不已的时候，陈启本人却安安静静的在家中。如此一来不仅解决了后顾之忧。In fact, the name of each mode indicates the function of the mode. The agent mode is to have one more agent class to carry out some operations for the original object. For example, when we rent a house, we go back to find an intermediary. Why? Because you do not have a comprehensive grasp of the housing information in this area, I hope to find a more familiar person to help you do it. This is what the agent here means. Another example is that we sometimes engage in lawsuits, we need to hire lawyers, because lawyers have expertise in law and can operate for us and express our ideas. Let's look at the diagram first: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: