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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.这话又掀起一波声浪。1853年10月20日，因争夺对巴尔干半岛控制权，土耳其、英法等国先后向俄宣战，战争持续至1856年，以俄国失败告终。战争的失败引发了俄国国内的一系列变革，其中也包括了废除农奴制。The professional mode can be opened by drawing the pro button at the bottom of the camera interfaceFirst of all, we can judge whether we are teammates or enemies according to the color of the team. There are also three methods win, lose, and die. If one person dies every time, whether all the dead teammates are dead or not, if all are dead, they will lose, so they need to cycle their teammates and tell the members of each teammate that they have lost, and at the same time they need to cycle their enemies and tell their enemies that they have won. Therefore, every time a person dies, it is necessary to make a cycle to judge whether all his teammates are dead. Therefore, each player and other players are tightly coupled together.