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Mediator pattern defines a mediation object to encapsulate the interaction between a series of objects. Intermediaries do not need to explicitly refer to each other between objects, thus reducing coupling and independently changing their interaction behavior. The specific structure diagram is as follows:One day in April 2014, he and another young man went on a mountain tour together. When he found four suspicious targets suspected of illegally crossing the border in the dim light of night, he asked another young man to go down the mountain to inform the villagers that he would risk stepping forward and strike up a conversation with them to delay the time. Who knew the other party was very cunning, aware that he was a border guard, he pulled out a machete more than one meter long and cut off his arm with one knife. He told me that it was worth the arrest of the four criminals with one arm.1. On-site handling当然刘邦、张良等人或许猜得出他是佯装，但这yijing不重要。到了及笄之年，该出嫁的嫡公主孟玉珥，却一连克死了四个准驸马！不仅纳夫之路如此坎坷，还被卷入惊天谜案。九王爷希白川征战归来，出现了神秘的血雨腥风，掀起埋藏已久的前尘波澜，冥冥之中他与公主殿下的关系也日渐暧昧起来。一桩柱神秘离奇的案件背后，拉扯出了一段段不为人知的过往。尘封的迷雾终将散去，一切的未知，前尘今朝的羁绊，不为人知的暗涌，远方良人竟是那个曾经“不靠谱不着调“的九皇叔。Singleton mode refers to ensuring that there is only one instance of a class and providing a global access point. It solves the problem of the number of entity objects, while other builder modes all solve the coupling problem brought by new. The main points of its implementation include: