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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.1938年10月武汉弃守后，中国抗战进入相持阶段，“文夕大火”却把即将成为抗日前线的长沙付之一炬。铁血将军薛岳临危受命，赴任第九战区代司令长官；他曾经的对手——八路军驻湘通讯处彭中华，则奉中共中央之命，主动上门献计献策，与薛岳并肩尽抗敌守土之责。经历悲壮惨烈的恶战，薛岳终于在中国共产党和湖湘群众的密切配合与支持下，指挥三湘虎将先后逐退了冈村宁次、阿南惟畿对长沙的三次进攻。而像李本忠这样身不由己加入到抗战洪流中的小人物，亦在艰苦奋战的洗礼中逐渐成长为一位智勇双全的铁血战士。当第三次长沙会战结束，抗战还任重道远，但中国人民已经用铁的事实证明了毛泽东《论持久战》中的论断：“坚持抗战，坚持统一战线，最后的胜利必然属于中国！”吕馨把手机放到陈启嘴边。　　小白和周自横的儿子大鹏(