How do I use ConcurrentHashMap in Java?

What is ConcurrentHashMap and how do I use it in Java?

ConcurrentHashMap is a thread-safe variant of HashMap. You can use it to store key-value pairs in a concurrent environment.

Can you show me a simple example of how to create and use a ConcurrentHashMap?

Sure! Here's a basic example:

import java.util.concurrent.ConcurrentHashMap;

public class Example {
    public static void main(String[] args) {
        ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>();
        map.put("One", 1);
        map.put("Two", 2);
        System.out.println(map.get("One")); // Output: 1
    }
}

What are the advantages of using ConcurrentHashMap over HashMap?

The main advantages are thread safety and better performance in concurrent scenarios, as it allows multiple threads to read and write without locking the entire map.

Are there any limitations I should be aware of when using ConcurrentHashMap?

Yes, while ConcurrentHashMap is thread-safe, it does not allow null keys or values, and some operations may not be atomic.