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Defines an interface for creating objects, allowing subclasses to decide which class to instantiate. Factory methods delay the instantiation of a class to its subclasses.Set the methods in the above multiple factory method modes to static, and call them directly without creating instances.Heilongjiang Province《大头儿子和小头爸爸》是一部系列性的童话组合，它由诸多微小而有趣的故事组成。 大头儿子、小头爸爸、围裙妈妈是一个三口之家，他们是中国现代家庭教育典型的缩影。这是一个普通而又平凡的家庭，但它所具有的特质是任何一个家庭都不具备的，因为它是由强烈的现实性与浓郁的幻想性所构成的。 片中塑造了三个栩栩如生的形象，而这三个形象的深刻寓意在于揭示了在中国当代家庭中爸爸、妈妈和孩子所处的真实地位和他们各自代表的特定的文化内涵。State machines also have a wide range of uses in game development, especially the logic writing of game AI. The main characters in the game have various states such as walking, attacking, defending, falling and jumping. These states are both interrelated and constrained. For example, if attacked during walking, it will switch from walking state to falling state. In the state of falling, it can neither attack nor defend. Similarly, you cannot switch to the defensive state during the jump, but you can attack. This kind of scenario is very suitable to be described by state machine. The code is as follows:(four) the list of employees and their identity cards, the qualification certificate of registered fire engineers and their social insurance certificates, the professional qualification certificate of special types of work in the fire industry, and a photocopy of the labor contract;《天下财经》节目是北京电视台唯一一档证券类节目，一直以来，都是周一至周五证券市场交易时间播出，而每周末是金融市场、资本市场的总结时间，对于周末时段的财经节目，一直有着较强的观众需求，为此，《天下财经》在2007年增加周六的播出。009年11月天下财经推出：“天下财经·百姓炒股秀”节目。节目的宗旨是：“立足百姓，服务百姓”。节目推出一年多至今已有百余位普通股民走进了演播室，接连涌现出普通股民里的巴菲特、索罗斯、彼得·林奇们……他们用自己的语言，讲述老百姓自己的投资故事。他们虽然有着各自的财富神话和投资传奇，但是却有个共同的特点——他们都是普通的股民，都来自普通老百姓。