*** 32,41 **** --- 32,42 ---- * @author Josh Bloch * @since 1.5 * @serial exclude */ class JumboEnumSet<E extends Enum<E>> extends EnumSet<E> { + @java.io.Serial private static final long serialVersionUID = 334349849919042784L; /** * Bit vector representation of this set. The ith bit of the jth * element of this array represents the presence of universe[64*j +i]