From what I can infer, HashMaps are replaced at runtime by a custom implementation, probably for better logging. However, it fails to account for null keys (which are valid for HashMaps, and not for ...

A frequently asked question in a Java interview is: How to implement a Java HashMap? Java job seekers must fully grok this important concept if they want to ace the interview. The HashMap tutorial ...

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HashMap は 「名前とデータをセットにして保存できる箱」 みたいなものだよ。 たとえば、「国」と「首都」をセットで保存する」 ことができる。