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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.那人问道：王爷可是因为田翰林纳妾之事？英王诧异道：这事难道已经天下皆知了不成？黑影摇头道：没有。爱情中只有遇错的人，没有不对的星座。《幸福45度角》着重刻画了现代都市三男一女之间的爱情纠葛，张可佳在片中饰演一名在时尚杂志工作的新进白领，虽然懵懂但兢兢业业。生命中同时出现三位性格背景迥然不同的男子，李少龙扮演的金融才俊、王子强扮演的前男友、刘令飞扮演的咖啡厅老板同时对可佳展开猛烈的追逐，演变三男一女的矛盾局面，“爱男——爱难”，可佳徘徊在其中最后做出了怎样的选择，究竟情归何处……一日，天光发现父亲的旧电话神奇响起，对方声称自己是警察，只是所说所讲都停留在八十年代。细问起才发现那竟是二十年前的父亲大河！二人合作无间，跨越两个时空，共同追查真凶。　　期盼着和平的国家，而成为了土耳基史上最年轻的将军。Principle: Traditional tobacco is smoked by ignition. The temperature of tobacco when burning reaches 800 degrees. Nicotine, carbon monoxide, tar, etc. will be produced in the process of tobacco burning. At the same time, tobacco itself also has fragrance released. Smokers are mainly satisfied by smoking nicotine and tobacco fragrance. There are more than 2,000 kinds of harmful ingredients produced by smoking, The main components that cause harm to human health come from tar produced in the combustion process, However, the working temperature of the heating non-burning electronic cigarette is about 300. Not more than 300 degrees, Tar is mainly produced at over 400 degrees, In other words, Heating does not burn electronic cigarettes. Due to the relationship between temperature, A small amount of tar is produced, which can be ignored. Moreover, the temperature at which heating does not burn is only about 300 degrees, so there is no combustion, no open flame and no soot. However, the aroma and smell of tobacco are still released, and smokers can also obtain nicotine, so that smokers can also obtain the feeling of smoking real cigarettes.