¿Puedo poner enumeración en la interfaz?

Can I put enum in interface?

It’s perfectly legal to have an enum declared inside an interface . In your situation the interface is just used as a namespace for the enum and nothing more. The interface is used normally wherever you use it.

You cannot create an object of an enum explicitly so, you need to add a parameterized constructor to initialize the value(s). The initialization should be done only once. Therefore, the constructor must be declared private or default. To returns the values of the constants using an instance method(getter).

Enum Values You can assign different values to enum member. A change in the default value of an enum member will automatically assign incremental values to the other members sequentially. You can even assign different values to each member.

We can create abstract methods within an enum. In that case, all of the Enum constants will become abstract and will be required to implement declared abstract methods.

Enum constants are implicitly static and final and you can not change their value once created. Enum in Java provides type-safety and can be used inside switch statements like int variables.

By default, the enum value is its method name. You can however override it, for example if you want to store enums as integers in a database, instead of using their method name. An enum value doesn’t have to be a string, as you can see in the example.

Steps 1 Create an Interface called Direction and declare a method called showDirection (). 2 Create a BasicDirection Enum by implementing Direction. 3 Put entries for NORTH, SOUTH, EAST, and WEST. 4 Please note that as it implements the Direction interface, each Enum has to override the showDirection method.

Defining an enum is like defining a class or defining an interface. You could just put it in one of your class files, inside the namespace but outside the class definition, but if several classes use it, which one do you put it in, and whichever you choose you will get “Type name does not match file name” warnings.

Create a BasicDirection Enum by implementing Direction. Put entries for NORTH, SOUTH, EAST, and WEST. Please note that as it implements the Direction interface, each Enum has to override the showDirection method. Create an AdvanceDirection Enum with NORTH-EAST, NORTH-WEST, etc. entries.

Following is the easiest method to cast an int to enum. How to check If a Enum contain a number? The Enum.IsDefined () method tests if a particular value or name is defined within an enumeration’s list of constants. This method requires two parameters. The first one is the type of the enumeration to be checked.