[threeten-dev] some questions for with() method in java.time.chrono.ChronoLocalDate

[Patrick Zhang]

Hi Team,

I am reading source code of threeten project and find something strange 
in java.time.chrono.ChronoLocalDate.
There are 2 with() methods, mostly I am confused by below:
======
     default ChronoLocalDate with(TemporalField field, long newValue) {
         if (field instanceof ChronoField) {
             throw new UnsupportedTemporalTypeException("Unsupported 
field: " + field);
         }
         return ChronoDateImpl.ensureValid(getChronology(), 
field.adjustInto(this, newValue));
     }

======

As you know, ChronoLocalDate with(TemporalField field, long newValue) is 
not DEFAULT in ChronoLocalDateTime and ChronoZonedDateTime.

1. Why we make it as default in ChronoLocalDate?
2. The implement looks strange. Why it does not support standard 
ChronoField and must throw UnsupportedTemporalTypeException explicitly?

Regards
Patrick