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。

This project contains Java code examples demonstrating how to use HashMaps in Java. The project showcases how to manipulate HashMaps, including adding, retrieving, removing elements, and counting the ...

Community driven content discussing all aspects of software development from DevOps to design patterns. Java collection classes allow a developer to keep track of contained items in one of two ways, ...

A data structure is a specialized format for organizing, processing, retrieving and storing data. There are several basic and advanced types of data structures, all designed to arrange data to suit a ...