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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.The intermediary mode is also used to reduce the coupling between classes, because if there is a dependency relationship between classes, it is not conducive to the expansion and maintenance of functions, because as long as one object is modified, other related objects have to be modified. If you use the mediator mode, you just need to care about the relationship with the Mediator class, the relationship between specific classes and the scheduling to the Mediator, which is a bit like the spring container. Let's look at the picture first:Good book!《暗中第一季》由Corinne Kingsbury执笔，讲述一个充满缺点﹑无礼的盲女是她那贩毒朋友被杀时的唯一「目击者」，而警方不理会她的证供后，她决定与导盲犬Pretzel去试图找出真凶。期间女主仍然得应付自己的感情生活，以及那份由保护欲过盛父母提供的导盲犬学校工作。只是一夜之间也都没了。　　其他演员包括Maria Gabriela de Faria﹑Josh Segarra﹑Kevin Bigley﹑Gerry Dee﹑Ulka Simone Mohanty及Megan Park。　　现在，三人所选择的恶劣的爱情开始了！