各月の第三日曜日は？

今年の各月の第三日曜日がいつなのかを見てみる。

import static java.time.DayOfWeek.SUNDAY;
import java.time.LocalDate;
import static java.time.temporal.TemporalAdjusters.dayOfWeekInMonth;

public class ThirdSundays {
    public static void main(String[] args) {
        final LocalDate START = LocalDate.of(2016, 1, 1);
        final LocalDate END = LocalDate.of(2017, 1, 1);
        for (LocalDate d = START; d.isBefore(END); d = d.plusMonths(1)) {
            System.out.println(
                d.with(dayOfWeekInMonth(3, SUNDAY))
            );
        }
    }
}

$ java ThirdSundays 
2016-01-17
2016-02-21
2016-03-20
2016-04-17
2016-05-15
2016-06-19
2016-07-17
2016-08-21
2016-09-18
2016-10-16
2016-11-20
2016-12-18