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

Java ConcurrentHashMap.computeIfAbsent() is a method in the Java ConcurrentHashMap class that computes a value for a given key if the key is not already mapped to a value. If the key is absent, it applies a mapping function to compute a new value and inserts it into the map. Introduced in Java 2014 with Java 8, computeIfAbsent() is particularly useful in concurrent applications for lazily initializing values in a thread-safe manner.

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