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迭代模式
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模型:行为模型
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```java
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思想:
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1. 将遍历和实现分开,降低耦合
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2. 遍历iterator,可扩展。比如可以实现顺序遍历,又可以另外实现倒序遍历。这样的修改对实现改动小
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3. 实现的修改,对遍历影响小.
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```
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