What is a ConcurrentHashMap and how is it used?

Can you explain what a ConcurrentHashMap is?

A ConcurrentHashMap is a thread-safe variant of HashMap in Java, allowing concurrent access by multiple threads.

How does it handle concurrency?

It uses a technique called lock striping, which divides the map into segments, allowing multiple threads to access different segments simultaneously.

What are some use cases for ConcurrentHashMap?

It's commonly used in scenarios where high concurrency is required, such as caching, maintaining shared data, or in multi-threaded applications.

Can you give me a code example of using ConcurrentHashMap?

Sure! Here's a simple example:

ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>();
map.put("key1", 1);
map.put("key2", 2);

map.forEach((key, value) -> System.out.println(key + " : " + value));