Efficiently converting java string to its equivalent enum

Question

Given a string i want to get the enum equivalent of it in constant time. I have a enum defined like the one shown in the question. Best way to create enum of strings?

Answer 1

Is Enum.valueOf() not sufficient? How would you imagine being more efficient than that? There's (usually) no need to have an enum STRING_ONE("ONE") - just call enum value ONE and you get .valueOf() lookup for free.

Otherwise, just create a private static Map and provide a similar valueOf() method that looks up against the Map.