Question

Given the following definitions:

public enum SampleEnum1 { Uno, Dos, Tres }
public enum SampleEnum2 { One, Two, Three, Four }

I need two methods doing this:

• Given the integer 2, return Dos if applied to SampleEnum1, Two if applied to SampleEnum2
• Given the value One, return 1

In fact I need to translate an enumeration litteral into its sequence number in the enumeration definition, and vicae versa.

I don’t mind using generics, reflexion, or whatever, as long as the same 2 methods work for any enumeration.

Do you have the solution?

Answer 1

Another approach is to use a helper method like

public static <E etxends Enum<E>> E lookup(Class<E> eClass, int number) {
     return eClass.getEnumConstants()[number-1];
}

SampleEnum1 se1 = lookup(SampleEnum1.class, 2);

BTW: You could start with Zero which would simplify your code as well.