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"Qin, your sister, it's stupid to ask you such a question. Collect cards for me!" As if very angry at your words and deeds, a book hit you in the face. -Accurately speaking, it is a collection card book, but strangely, it seems to be.... a collection card book that has already been collected.板栗看着他好端端的腿脚，黑着脸道：不会撒谎就别弄假。This is the basis of the opening and closing principle, and the specific content: interface-oriented programming, relying on abstraction rather than concreteness. When a specific class is used when writing code, it does not interact with the specific class, but interacts with the upper interface of the specific class.陈启声音顿了顿，说道：一个天才少年在创造了家族空前绝后的修炼纪录后，突然成了废人，整整三年时间，家族冷遇，旁人轻视，被未婚妻退婚……种种打击接踵而至。The execution results are consistent with the previous code, but the benefits of using the state mode are obvious. It can localize the relationship between each state and its corresponding behaviors, which are scattered and encapsulated in their corresponding state classes, making it easy to read and manage the code. In addition, the switching between states is distributed within the state class, which makes it unnecessary to write too many if, else conditional branch languages to control the switching between states.影片主要讲述单亲妈妈为怀揣梦想的儿子治疗残疾双腿四处求医的艰难痛苦历程。主要凸现出小人物汇聚的大梦想正能量，更接地气的反映真实社会生活，涉及到了家庭教育、妇女儿童、交通安全、医疗事故等方面的坚持梦想的情感励志生活。