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

Java Enum is a special class used to define a fixed set of constants, such as days of the week, months, or cardinal directions. Enums are more powerful than simple constants because they can have methods, fields, and constructors. Introduced in Java 2004 with Java 5, Java Enums make code more readable and type-safe by ensuring that only predefined constants are used, thus preventing errors from invalid or missing values.

https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html