https://DevOpsCloud.io -- Cloud Monk Losang Jinpa, Ph.D., MCSE/MCT, GitOps DevOps Engineer

Java ConcurrentHashMap.merge() is a method in the Java ConcurrentHashMap class that merges a key-value pair into the map. If the key is already present, it applies a remapping function to the existing value and the new value, allowing for complex updates in a thread-safe manner. Introduced in Java 2014 with Java 8, merge() is commonly used in concurrent programming for safe value updates in shared maps.

https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html