When and how to use the ConcurrentHashMap in Java?

The following article describes When and how to use the ConcurrentHashMap in Java.

ConcurrentHashMap is a thread-safe implementation of the java.util.Map interface in Java. It provides a way to store and retrieve key-value pairs, just like a regular HashMap, but with the added guarantee of thread-safety.

The ConcurrentHashMap class uses a fine-grained locking mechanism to ensure that multiple threads can access the map concurrently without any data inconsistencies. This makes it ideal for use in multi-threaded environments where multiple threads need to access the same data simultaneously.

Here is an example of how to use ConcurrentHashMap in Java:

import java.util.concurrent.ConcurrentHashMap;

public class Main {
  public static void main(String[] args) {
    ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>();
    map.put("Luk", 45);
    map.put("Luke", 90);
    map.put("Lukette", 75);

    System.out.println(map.get("Lukette"));
    System.out.println(map.get("Luke"));
    System.out.println(map.get("Luk"));
  }
}

In conclusion, use ConcurrentHashMap when you need a thread-safe map implementation in a multi-threaded environment. It provides fast and efficient access to the data, with the added guarantee of thread-safety.Regenerate response

Further Reading