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Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:Chang is good. "Zhang Xiaobo said.《龙八夷》是韩国SBS于2015年8月5日起播出的水木连续剧，由吴珍锡导演，张赫麟编剧，周元，金泰熙主演。该剧主要讲述了因为妹妹心脏透析而饱受债务折磨的男人的故事。雷小宝（姜文 饰）和妹妹雷小健（于莉 饰）是情同手足的兄妹，两人相依为命，感情十分要好。小宝是一名刑警，近日来，一宗犯罪金额高达两千万元的诈骗案让小宝陷入了僵局之中，他所缉拿的罪犯陈子良（万梓良 饰），竟然正是小健的男友。"What happened later?" I knew the story was far from over, so I couldn't wait to ask him.　　此时，巩渭平又接受了上级代号为烛光同志的秘密指示，令其打入国民党中统特务组织。为完成这一特殊使命，巩渭平不得不与深爱着的女友分手，并与余雪瑶结为夫妇。