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尹旭并不认识他，只是听张功曹说了吴臣的大概年岁容貌，故而出口试探，不想误打误撞蒙对了。5. When the screen direction is switched (whether the vertical screen cuts the horizontal screen or the horizontal screen cuts the vertical screen, it will be called).谈谈越国的处境？这几个字电光火石般崩入尹旭脑海之中，想起了当日陈平来找自己时间，谈话时何尝不是这般切入的。还有，以后不要这么称呼我，君臣有别没有义父，孩儿又岂能活到今日？至于这王位就更不用说了。Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.与此同时，抄家的收获也被一件件搬出来。The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.