Java: Check if enum contains a given string?

Question

Here\'s my problem - I\'m looking for (if it even exists) the enum equivalent of ArrayList.contains();.

Here\'s a sample of my code problem:

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Answer 1

Few assumptions:
1) No try/catch, as it is exceptional flow control
2) 'contains' method has to be quick, as it usually runs several times.
3) Space is not limited (common for ordinary solutions)

import java.util.HashSet;
import java.util.Set;

enum Choices {
    a1, a2, b1, b2;

    private static Set _values = new HashSet<>();

    // O(n) - runs once
    static{
        for (Choices choice : Choices.values()) {
            _values.add(choice.name());
        }
    }

    // O(1) - runs several times
    public static boolean contains(String value){
        return _values.contains(value);
    }
}