![]() Month name, Planet names etc as these entities will have fixed set of known values. For example you can use enum for declaring Days name, You should use that entity as an enum type. Of an entity at compile time(or design time) and you know that these values won't change later, If you know all possible values(constant) You should use enum types any time you need to represent a fixed set of constants. No such specific methods are added with classes.Įach enum-type internally extends Enum class. ![]() Java compiler adds some methods like values(), valueOf() to an enum type after compilation. Enum program with method, constructor and variableĮnums are generally used to declared a set of pre-defined constants.Ĭlasses are design to expose state and behavior of an object.Ĭonstructor of an enum type can be private or package-private only.Ī class constructor can have any access modifier.įirst line of code must be constant declaration.Ĭlasses doesn't have any such restrictions. The program below shows the usage of method, constructor and variable inside an enum type. Enum in Java are type-safe: Enum has there own name-space. Since each constant in an enum type is internally an instance of enum type, so we can call the methods of an enum type by using it'sĬonstants. Since Java does not support multiple inheritance, an enum cannot extend anything else. The access modifier of constructor for an enum type must be either private or package-private(no modifier).Īn enum type can have multiple constructors. Looks for the matching constructor while compilation. If the enum type contains constructor, ensure that you have a matching constructor for each constant declaration since it ![]() The enum constant declaration must end with semicolon( ) if the enum type contains method, constructor or field. The first line of code in an enum type must be constant declaration.
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