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It's the ticket gate. The ticket gate of Nagoya subway is no different from that of China. It looks like this: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:Now go into the container to see if/data is present:Appearance mode focuses on simplifying interfaces and simplifying the dependency relationship between component systems and external client programs.她是机场安检，安全检查是她的义务和责任，而这次她检查的人，却是她熟悉又多少次魂牵梦萦的脸……与曾经深爱之人再次重逢，有多少尽在不言中。　　没多久，延安、重庆均获得了日寇这一险恶计划。延安方面启用了多年潜伏在国民党军统的高级特工林婴婴， 重庆方面则启用了高级特工金深水，以粉碎日寇的阴谋。金深水、林婴婴从此和川岛野夫、小野为首的日军反谍报人员殊死较量。The following is a specific diagram and how to kill.