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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.门虚掩着，杨长帆便推门跨过门槛进去，正撞见一只鸡。This standard is applicable to flying students in school.与挚友的竞争，来自所爱女性的告发在失去很多的同时，男人最后得到的东西是…！？　　这下子我们的顽皮小少爷会轻易答应吗？Sky时刻想着要打破保镖先生的规矩，然而两人开始慢慢对彼此有了更深入的了解。两人共同经历了很多的挫折、危险以及来自各方的考验，最后产生了一份伟大的爱情，即使需要牺牲掉两人的生命，他们也会义无反顾。Legend-level equipment attributes have been greatly improved and adapted, and Lv75 ~ 85-level epic equipment have all improved their attributes.讲述了一群沉迷于科技的年轻人参加了一个森林里的改造营，但那里的邪恶力量打算让他们从此无法上线。