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嗯，东来定会全力以赴。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.千金小姐关关不计回报的帮助学长韩山创业，收获美好爱情。sean“圣科罗尔”。作为漫画家、插图画家活跃在这个领域，Showtime宣布续订Kevin Bacon及Aldis Hodge主演的《#山巅之城# City on a Hill》第二季。It is a wood carving shot by spot metering and illuminated by light."I think the United States and the Soviet Union are the first world. The centrists, Japan, Europe, Australia and Canada, are the second world. We are the third world."