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The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.Therefore, although we use the service iptables start to start the iptables "service", in fact, iptables does not have a daemon, so it is not a real service, but a function provided by the kernel.人称「为食神探」的麦犀(阮兆祥饰)，拥有一条「金舌头」，凭此破了不少大案。「鲟龙事件」让爱吃的他因贪吃而知法犯法，被判入狱两年。两年来，他与「美味」二字绝缘，出狱后便立即到有名的钏记海鲜酒家，大吃一顿，重拾享受美食的感觉。【空军】是庆祝电视台启播25周年，在新加坡空军部队的协助下拍摄的，由6个独立单元组成，内容反映空军人员的训练、工作与家庭生活。 除了气宇轩昂的男艺人李南星、陈天文、陈之财、郑国平、王玉青、洪国锐等纷纷以帅气十足的空军服亮相外，展示了新加坡空军部队的各种先进配备及气势磅礴的军事场面。 一系列7集的单元故事包括： “夺标”－描述空军飞行员训练学校的龙争虎斗； “驾着天马的战士”－在天气恶劣的澳洲上空参加军事演习的空军机师，如何临危不乱，凭日月星辰辨认方向，把军队安然送到目的地； “误航”－在美丽女间谍色诱下，空军如何进行反间谍措施化险为夷……I. Dangerous Sports Business Activities　　【孔升妍】饰演比男人更像男人的泼辣姑娘【狗屎】。为了在竞争激烈的市场底层生存，放弃了女性装束、打扮成男人模样，只要给钱什么工作都能办到，劈柴、运米、宰杀活鱼，甚至还会劝架。Yang Zhifeng, a collection store specializing in socks, underwear and household clothing, has become a dark horse for Tmall's new retail.