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遍历聚合对象中的元素——迭代器模式(四).md
在迭代器模式结构图中,我们可以看到具体迭代器类和具体聚合类之间存在双重关系,其中一个关系为关联关系,在具体迭代器中需要维持一个对具体聚合对象的引用,该关联关系的目的是访问存储在聚合对象中的数据,以便迭代器能够对这些数据进行遍历操作。
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