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The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:Qu Shuihua, 5G Network Engineer of China Mobile: The population density of the city is relatively high, the buildings in the city are relatively dense, and the whole wireless environment is relatively complex. The planning pilot projects of 2G, 3G and 4G have almost run out and the space is not large.23 Design Patterns in Java:安琪媛出生在一个平凡的大家庭里，因为母亲去世的早，父亲安向东带着她同姥爷梁永顺和姥姥潘素芬生活在一起。姥爷梁永顺和姥姥潘素芬坚守着一家祖传的面条老作坊，除了大女婿安向东偶尔帮衬着老两口打理这间老作坊，其他子女都在外工作，对老作坊的手艺和生意丝毫不感兴趣。安琪媛个性乖巧懂事，但她一直不被财大气粗的婆婆林秀琴接受，她与丈夫林天佑的婚姻也被婆婆林秀琴不断破坏。安琪媛在一系列误打误撞中与大财团董事长之子齐霁结识，并屡屡得到齐霁的帮助。然而齐霁的善良也被安琪媛的婆婆林秀琴利用，让林天佑陷入对妻子安琪媛的种种误会中，两人的婚姻濒临破裂。传承三代的梁家食品老作坊濒临倒闭，年迈力衰的梁永顺和老伴潘素芬为劝说儿女们回来继承家业，无奈生出一计，称有巨额家产。所有儿女果然纷纷归来。再想起尹旭以前带兵和秦军作战，章邯、董翳等人都在他手上吃过亏，所以难免忌惮。3.2. 2 Turn on the event scheduler