@Override
    public boolean isLeapYear(long prolepticYear) {
        if (prolepticYear <= CUTOVER_YEAR) {
            return JulianChronology.INSTANCE.isLeapYear(prolepticYear);
        }
        return IsoChronology.INSTANCE.isLeapYear(prolepticYear);
    }
@ Override public boolean isLeapYear ( long prolepticYear ) { if ( prolepticYear <= CUTOVER_YEAR ) { return JulianChronology . INSTANCE . isLeapYear ( prolepticYear ) ; } return IsoChronology . INSTANCE . isLeapYear ( prolepticYear ) ; }
Checks if the specified year is a leap year.
<p>
The result will return the same as {@link JulianChronology#isLeapYear(long)} for
year 1752 and earlier, and {@link IsoChronology#isLeapYear(long)} otherwise.
This method does not validate the year passed in, and only has a
well-defined result for years in the supported range.

@param prolepticYear  the proleptic-year to check, not validated for range
@return true if the year is a leap year