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"Boxing"Self-imported SFCEach 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.Civil aviation pilots are the main force in the civil aviation industry. The clothes of civil aviation pilots are white shirts in summer and black suits in winter. The colors are basically uniform all over the world, but the styles are formulated by various companies, and each company is not the same. Civil aviation pilots are roughly divided into two grades: the captain and the co-pilot, but the captain and the co-pilot are divided into many grades. The co-pilot is generally divided into the first-stage co-pilot (F1), the second-stage co-pilot (F2), the third-stage co-pilot (F3), the fourth-stage co-pilot (F4) and the left-seat co-pilot (FL). The captain is divided into the captain, the teacher, the inspector, etc.在实力处于伯仲之间时，影响此战胜败的关键的还是智谋和作战方式，在这一点上龙且不如韩信。The people watching this case are especially uncomfortable! To be extremely miserable　　宋家战前在内地已是声名远播，家族秉承中国的“礼”节，独具匠心创作了许多做饼的秘籍。简单的一块饼，体现了亲情、心意、友谊、和关杯。一块饼虽然是一份不贵重的东西，但是人要是都守这份礼，那人与人的关系、家人的关系、朋友的关系一定来得更亲密和融洽。因为亲手送上一份可口的饼食给挚爱亲友，受礼的人会感受到被亲朋重视和关爱。所以做饼的人每一块饼都不能马虎，都要放上十足的诚意。