Question

I have some enums like this:

public enum Classification {
    UNKNOWN("Unknown"),
    DELETION("Deletion"),
    DUPLICATION("Duplication"), ....

but some of them have like 20 members, so currently in code I deal with them with huge if/else blocks like this:

int classification= rs.getInt("classification");
        if (classification == Classification.UNKNOWN.ordinal()) {
            variant.setClassification(Classification.UNKNOWN);
        } else if (classification == Classification.DELETION.ordinal()) {
            variant.setClassification(Classification.DELETION);

( rs is from JDBC tho).

Does Java have a better way this these big if/else blocks to do what I am doing? some sorting of looping through it?

Answer 1

If the db value is the ordinal of the Enum then:

int classification= rs.getInt("classification");
variant.setClassification(Classification.values()[classification]);

I’ll leave bounds checking as an exercise for the reader.