@Override
        public int hashCode() {
            return Objects.hash(subjectPrincipal, subjectAltNames);
        }
Copy entry from one map into another.

@param destMap   The map to copy entries into.
@param srcMap    The map to copy entries from.
@param key       The entry with this key will be copied
@param <K>       The map key type.
@param <V>       The map value type.
clients/src/main/java/org/apache/kafka/common/security/ssl/SslFactory.java