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。
InfoQ

OpenJDK and HashMap …. Safely Teaching an Old Dog New (Off-Heap!) Tricks

A monthly overview of things you need to know as an architect or aspiring architect. Unlock the full InfoQ experience by logging in! Stay updated with your favorite authors and topics, engage with ...
TheServerSide

HashMap vs. Hashtable: Which map should you choose?

While the Hashtable was part of the initial Java release over two decades ago, the HashMap is the correct key-value store to use today. One key HashMap vs. Hashtable difference is the fact that the ...
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 ...
ITmedia

Java Tips：Iterator、Enumerationなどループあれこれ：JAVA Developer

java.utilパッケージにはコレクションを表現するクラスが多数あります。配列では要素数が固定になりますから，不定数のオブジェクトを扱うときには便利に使えます。J2SE 5では，Genericsを導入してさらに使いやすく安全になります。 さらに，java.util ...
GitHub

hashmap-java

This is a simple Java console application for an online shopping system. It allows users to log in, buy products, cancel products, display all products, and log out. The application uses a HashMap to ...