if I understand your question correctly, you can't do that.
Please take a look to Java documentation about Enums : https://docs.oracle.com/javase/tutorial/java/javaOO/enum.html
Enum Types
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.
Because they are constants, the names of an enum type's fields are in
uppercase letters.
In the Java programming language, you define an enum type by using the
enum keyword. For example, you would specify a days-of-the-week enum
type as:
public enum Day {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY,
THURSDAY, FRIDAY, SATURDAY }
You should use enum types any time you need to represent a fixed set of constants. That includes natural
enum types such as the planets in our solar system and data sets where
you know all possible values at compile time—for example, the choices
on a menu, command line flags, and so on.