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王茂与黄依然在洛芙婚庆公司是上下级关系，两人从相识的那一刻起就充满矛盾，由于两人的文化差异，使彼此都不能理解。在随后的工作中，黄依然渐渐表现出来的刻苦精神和特有的才能被王茂欣赏，而在随后的工作中，黄依然也体会到他温情的一面。就在两人刚刚能够和平共处的时候，王茂却意外陷入一场事业危机，能够解救他的出路只有一条，拿到航空联盟的大型集体婚礼的合同。黄依然首当其冲协助王茂，两人克服重重困难，最终成功化解危机。在王茂与黄依然这一次跌宕起伏的闯关过程中，不知不觉擦出了爱情的火花，但是此时双方发现对方的内心深处对爱情有一堵心墙。王茂和黄依然想尽种种办法融化对方心中的冰山，尤其在共同经历了一场命悬一线的车祸之后，两人终于决定携手相伴此生。而此时的他们，对爱情的真谛和婚礼事业的神圣也有了更深层的理解 。Since the single mode is instantiated only once, the first call returns an instance object of a. When we continue to call, the instance of b is the instance of a, so aa is printed below.Iterator patterns are created for collection objects, For collection objects, It must involve the addition and deletion of collection elements, and certainly supports the operation of traversing collection elements. If the traversal operation is also placed in the collection object at this time, the collection object will bear too many responsibilities. At this time, the responsibilities can be separated and the traversal of the collection can be placed in another object, which is the iterator object.Don't draw with this shadow.After hearing these words, I briefly summarized and recorded the characteristics of two different "living biological weapons" on position 169 and position 142 in the interview notebook and compared them:Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.