Java HashSet.clone() is a method in the Java HashSet class that creates a shallow copy of the set. This cloned set contains the same elements as the original but is independent in terms of its storage. Introduced in Java 1995 with Java 1.2, clone() is commonly used when you need to create a backup of a set before performing destructive operations.

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