note

HashMapとMap

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。
TheServerSide

How a Java HashMap internal implementation works

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 ...
GitHub

HashMap$Node cannot be cast to class java.util.HashMap$TreeNode

Caused by: java.lang.ClassCastException: class java.util.HashMap$Node cannot be cast to class java.util.HashMap$TreeNode (java.util.HashMap$Node and java.util.HashMap ...
GitHub

NashTech-Labs/HashMap-Data-Structure

Fast lookups: Lookups take O(1) time on average. Flexible keys: Most data types can be used for keys, as long as they're hashable. Initial Capacity: It is the capacity of HashMap at the time of its ...