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The code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.十万年前，仙界诛仙混战，众神陨落，一本暗藏玄机的《生死天书》落入人间。青年考古学家陆云在一次科考中无意中闯入一间根本无法辨别年代的墓室，至此平静的生活被打破，开始了寻找各种谜团的惊险历程。Apache is written in the file with the following paragraph.5. Customize attributes in HTTP headers and verify这是怎么回事？难道一个微.博投票都有人刷票？大家议论道。Dependence Inversion Principle (DIP) means that abstraction should not depend on details, and details should depend on abstraction, which is the proposed "interface-oriented programming, not implementation-oriented programming". This can reduce the coupling between customers and specific implementations.　　赵大胆见识到了地雷的威力，决意偷学造雷技术。一次意外，他与女匪王马飞燕成了欢喜冤家，得她冒死相助；分分合合，他同被鬼子灭了门的鸿运行少爷刘运果最终联手，带领着一帮普普通通的人民群众，造地雷，埋地雷，大展地雷术，为把侵略者赶出家园，协助八路军大部队完成任务，做出了不可磨灭的贡献，谱写了一曲人民战争的英雄赞歌……