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。

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 ...

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 ...

The BOHMap is a hashmap implementation for Java 8 that uses off-heap memory for storing map entries (both key and value). This allows the map to grow past the available JVM heap space, and at the same ...