All of the elements in an enum set must come from a single enumeration type that is specified when the set is created either explicitly or implicitly. Java enums were added in Java 5.

Working with a type safe and performant enum set in your code (see java.util.EnumSet for a description) The set is just one numeric column in the database; everything is plain JPA … The enumeration() is a method of Java Collections class which is used to get the enumeration over the specified collection. JPA map collection of Enums. for beginners and professionals. Otherwise, the specified collection must contain at least one element (in order to determine the new enum set's element type).

Declaration:

Active 23 days ago. Ask Question Asked 11 years, 4 months ago. The Enumeration interface defines the methods by which you can enumerate (obtain one at a time) the elements in a collection of objects. This legacy interface has been superceded by Iterator. Syntax. Following is the declaration of enumeration() method: Tutorials, Free Online Tutorials, Javatpoint provides tutorials and interview questions of all technology like java tutorial, android, java frameworks, javascript, ajax, core java, sql, python, php, c language etc. If the specified collection is an EnumSet instance, this static factory method behaves identically to copyOf (EnumSet) . Creates an enum set initialized from the specified collection.

More precisely, a Java enum type is a special kind of Java class. The enumeration (Collection) method is used to get an enumeration over the specified collection. Although not deprecated, Enumeration is considered obsolete for new code. An enum can contain constants, methods etc. This Java enum tutorial explains how to create and use a Java enum. EnumSet class is a member of the Java Collections Framework & is not synchronized. A Java Enum is a special Java type used to define collections of constants. Java Collections enumeration() Method. It’s a high performance set implementation, much faster than HashSet.