5 Ways to Update Values in ConcurrentHashMap in Java 8 - Example Tutorial

In last article, I have showed you how to update value in HashMap and today we'll learn about how to update value in a ConcurrentHashMap. Some of you may question, can we use the same technique we used to update a value in HashMap here? well, you can but you need to keep in mind the difference between an HashMap and a ConcurrentHashMap. The HashMap is only meant to be updated by one thread at a time, hence you don't need to pay any attention to thread-safety or concurrency, but ConcurrentHashMap can be updated by multiple threads at the same time, hence you need to pay special attention. 

How to use ConcurrentLinkedDeque in Java? Example Tutorial

Hello guys, ConcurrentLinkedDeque is another amazing class from Java's concurrent collection package which can be used as high-performance, thread-safe and non-blocking data structure. As the name suggest, its a Deque which means its allows you to operate at both ends of queue. You can insert at one end and consume from other end. It's also concurrent and thread-safe which means multiple threads can operate on same queue at the same time. You can have multiple producer threads which are inserting data into the queue and multiple consumer threads which are consuming data from this data structure. Before going to discuss this topic, let me inform you that this article is in continuation of our deque article series. It's totally not mandatory to go through those articles, but it is highly recommended as they all play a part in the understanding of today's topic.