主要介绍HashMap的四种循环遍历方式，各种方式的性能测试对比，根据HashMap的源码实现分析性能结果，总结结论。
1. Map的四种遍历方式
下面只是简单介绍各种遍历示例(以HashMap为例)，各自优劣会在本文后面进行分析给出结论。
(1) for each[......]
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