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## 迭代器模式
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<div align="center"> <img src="pics/e89848b7-5dc3-419d-ae88-4c930da13306.png"/> </div><br>
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<div align="center"> <img src="pics/5_200.png"/> </div><br>
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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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