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

Java WeakHashMap is a class that implements the Java Map interface and uses weak references for its keys. This means that if a key object is no longer referenced elsewhere, it is eligible for garbage collection, even if it is still present in the map. Introduced in Java 1997 with Java 1.2, WeakHashMap is commonly used for caching scenarios where objects should not prevent garbage collection, such as in memory-sensitive applications or when implementing automatic cleanup for unused entries.

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