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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:万不可逼迫郑姑娘，得让她……心甘情愿嫁朕。[A] The minimum wage for each local enterprise is different, depending on the local minimum wage standard.　　老舍名著张国立邓婕等主演《我这一辈子》四大看点 　　This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:翻拍自2003年电影《魔鬼之后》，第一世得不到女主的爱，第二世还是爱得那么卑微，遭到惊扰而复活的吸血鬼 Maekin (Cee) 回来清算自己同前世恋人 Rommance (Noona) 及情敌 Witawat(Ohm) 之间的爱恨纠葛。在外打工的李文博回到家之后，发现他的家人之间出现了许多问题。为了维护好自己的家，李文博打算留在家中。而在这段时间，李文博被家人深深地感动着，他明白了一句话，家人永远是最亲近的人。