Java EnumSet.copyOf() is a static method in the Java EnumSet class that returns a new EnumSet containing the same elements as the specified EnumSet or Enum array. It provides a way to create a new set from an existing one while preserving the set’s elements. Introduced in Java 2004 with Java 5, copyOf() is useful for creating copies of sets without modifying the original set, particularly when dealing with enum constants.

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