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

Java AbstractMap.containsKey() is a method in the Java AbstractMap class that checks if a specified key exists in the map. It returns true if the key is present and false otherwise. Introduced in Java 1995 with Java 1.2, containsKey() is commonly used for verifying the existence of keys before accessing their associated values.

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