Ser.writeExternal

Implements the {@code Externalizable} interface to write the object. @serialData Each serializable class is mapped to a type that is the first byte _in the stream. Refer to each class {@code writeReplace} serialized form for the value of the type and sequence of values for the type.

!(ul) !(li)<a href="{@docRoot}/serialized-form.html#hunt.time.zone.ZoneRules">ZoneRules.writeReplace</a> !(li)<a href="{@docRoot}/serialized-form.html#hunt.time.zone.ZoneOffsetTransition">ZoneOffsetTransition.writeReplace</a> !(li)<a href="{@docRoot}/serialized-form.html#hunt.time.zone.ZoneOffsetTransitionRule">ZoneOffsetTransitionRule.writeReplace</a> </ul>

@param _out the data stream to write to, not null