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? Second, create an implementation class:Attack growth is carried out independently with growth, which changes with the independent change of grade and conforms to the formula of independence and fixed injury.As the name implies, iterator pattern is to access objects in an aggregation sequentially. Generally speaking, it is very common in collections. If you are familiar with collection classes, it will be very easy to understand this pattern. This sentence contains two meanings: one is the object that needs to be traversed, that is, the aggregated object, and the other is the iterator object, which is used to traverse the aggregated object. Let's look at the diagram:Public void del (Observer observer);天下三分，烽火四起，在这个英雄辈出的时代，战争不仅有刀光剑影，亦不只是血肉搏杀。秘密情报线上的生死角逐，正涌动于滚滚洪流的阴影当中。For PCB veneer that needs to be spliced, its four sides must ensure that after the components are installed, the component edges are at least 2mm away from the board edges.刑部大堂外已经围观了好些百姓。