Web Reference: An enum type is a special data type that enables for a variable to be a set of predefined constants. The variable must be equal to one of the values that have been predefined for it. Common examples include compass directions (values of NORTH, SOUTH, EAST, and WEST) and the days of the week. Jul 12, 2010 · Enums are reference types, in that they can have methods and can be executed from command line as well , if they have main method. See following "Planet" example from Sun/Oracle An enum is a special "class" that represents a group of constants (unchangeable variables, like final variables). To create an enum, use the enum keyword (instead of class or interface), and separate the constants with a comma.
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