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## Collection
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### 1. Set
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## Map
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- TreeMap：基于红黑树实现。
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## 迭代器模式
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Collection 继承了 Iterable 接口，其中的 iterator() 方法能够产生一个 Iterator 对象，通过这个对象就可以迭代遍历 Collection 中的元素。
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