How to retrieve Enum name using the id?

Question

I have the enum as:

public enum EnumStatus {

    PASSED(40L, \"Has Passed\"),
    AVERAGE(60L, \"Has Average Marks\"),
    GOOD(80L, \"Has Good         


        

Answer 1

This pattern can help you:

public interface Identifiable {

    @Nonnull
    T getId();
}

public final class GettableById & Identifiable> {

    @Nonnull
    private final Map idToValue;


    public GettableById(@Nonnull V[] values) {
        this.idToValue = Arrays.stream(values)
                .collect(Collectors.toUnmodifiableMap(Identifiable::getId, v -> v));
    }

    @Nonnull
    public V getById(@Nonnull K id) {
        var value = idToValue.get(id);
        if (value != null) {
            return value;
        }
        throw new NullPointerException("Cannot get value by id: %s".formatted(id));
    }
}

public enum DataType implements Identifiable {

    ANNUAL((short) 1), QUARTERLY((short) 2);

    private static final GettableById companion = new GettableById<>(values());

    @Nonnull
    private final Short id;


    public static DataType getById(Short id) {
        return companion.getById(id);
    }

    DataType(@Nonnull Short id) {
        this.id = id;
    }

    @Nonnull
    @Override
    public Short getId() {
        return id;
    }
}