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Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below.FLYWEIGHT refers to the lightest weight in boxing. The meta-sharing mode efficiently supports a large number of fine-grained objects in a shared way. The key to sharing the meta-sharing mode is to distinguish the intrinsic state from the extrinsic state. The intrinsic state is stored in the element and will not vary with the change of environment. The exogenous state changes with the change of environment. The extrinsic state cannot affect the intrinsic state, they are independent of each other. Distinguish the states that can be shared from the states that cannot be shared from the regular class, and eliminate the states that cannot be shared from the class. Clients cannot directly create shared objects, but should use a factory object to create shared objects. The meta-sharing mode greatly reduces the number of objects in memory.民国初年，被推翻的清廷受民国政府的优待，仍居于深宫，被视为国中之国的“小朝廷”，名士匠人仍以受到“朝廷”的恩宠为荣。 　　　　「任時光匆匆流去，我只在乎你…」天启擅长刻画女性角色，例如轻舞飞扬、练霓裳等。谁也没想到，范依兰习惯xìng的一个举动，竟然大大的刺jī了如雪，以至于这个满怀嫉妒之心的女子有些失衡。