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Iterator mode: Pay attention to encapsulating changes in specific fields, support changes in collections, shield complex internal structures of collections objects, and provide transparent traversal of collections by client programs."In short, it will be very fast and will not leave you much reaction time." Zhang Xiaobo said.For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.3. Candidates can only answer questions after the test bell rings. Candidates are not allowed to enter the examination room after blowing the boundary whistle 15 minutes after the examination. You can leave the examination room within 30 minutes before the final examination.　　但丁志明的生存之道，不知為何，竟被那个前来专访的方佳莹破坏殆尽。或者被东方不败杀死，这是刀客的宿命，必须要完成的宿命。