刚学Java那会儿，我也被这个"in"搞迷糊过。明明在代码里到处找不着in这个关键字，为啥老听人说"循环里用in"？今天咱就掰开揉碎了唠唠这事儿。 一、Java里压根没in这个关键字！ 先说个大实话：Java语法里根本没有in这个关键字！ 你翻遍官方文档也找不着。

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