Let's Talk about Map

As a Java Developer, the word Map is definitely not unfamiliar. Whether it’s in the development process or going out for an interview, we often encounter it. The most frequently used and interview questions are nothing more than these few, HashMap, HashTable, ConcurrentHashMap. So this article will summarize these points.

Starting with HashMap

HashMap is the most frequently used of the several Maps mentioned above, after all, the scenarios that need to consider multithreading concurrency are not too many. Below is a relationship diagram of Map, you can understand it.