Mutiple Values in single enum

Kashyap :

I have below enum

public enum ApiGroup {
    H("gp"),
    S_CARDS("cards"),
    S_CARDMETADATA("cardmetadata"),
    S_PRODUCTS("products");

    private String value;

    private ApiGroupType(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }

    private static final List<String> sApiGroups = Arrays
        .asList(ApiGroupType.S_CARDS.value, ApiGroupType.S_CARDMETADATA.value, ApiGroupType.S_PRODUCTS.value );

    public static List<String> getSApiGroupsList() {
        return sApiGroups;
    }

Currently, I am fetching the required values via creating List. If any future addition is required to the list, there is a need to add the required values first as enum, then in the list, is there any better way this addition at 2 places can be avoided. By adding value at single place should work.

Kartik :

Change your method to the following and delete the sApiGroups static list.

public static List<String> getSApiGroupsList() {
    return Arrays.stream(values())
            .filter(apiGroup -> apiGroup.name().startsWith("S_"))
            .map(ApiGroup::getValue)
            .collect(Collectors.toList());
}

Learn more about the values() method in the docs.

Edit

As per @ernest_k's comment, we don't need to stream for every call of this method. So can just have:

private static final List<String> sApiGroups = Arrays.stream(values())
        .filter(apiGroup -> apiGroup.name().startsWith("S_"))
        .map(ApiGroup::getValue)
        .collect(Collectors.toList());

public static List<String> getSApiGroupsList() {
    return sApiGroups;
}