81  * underlying rules, modeled by {@link ZoneRules}.

    81  * underlying rules, modeled by {@link ZoneRules}.

    82  * The rules are defined by governments and change frequently.

    82  * The rules are defined by governments and change frequently.

    83  * By contrast, the region identifier is well-defined and long-lived.

    83  * By contrast, the region identifier is well-defined and long-lived.

    84  * This separation also allows rules to be shared between regions if appropriate.

    84  * This separation also allows rules to be shared between regions if appropriate.

    85  *

    85  *

    87  * This class is immutable and thread-safe.

    87  * This class is immutable and thread-safe.

    88  *

    88  *

    89  * @since 1.8

    89  * @since 1.8

    90  */

    90  */

    91 final class ZoneRegion extends ZoneId implements Serializable {

    91 final class ZoneRegion extends ZoneId implements Serializable {