小编Ami*_*ifa的帖子

我试图得到一个月的第一个星期日。我达到的是获得一年中的所有星期日

import static java.time.temporal.TemporalAdjusters.firstInMonth;

    public static void FindAllSundaysOfTheYear () {
        // Create a LocalDate object that represent the first day of the year.
        int year = 2021;
        LocalDate now = LocalDate.of(year, Month.JANUARY, 1);
        // Find the first Sunday of the year
        LocalDate sunday = now.with(firstInMonth(DayOfWeek.SUNDAY));

        do {
            // Loop to get every Sunday by adding Period.ofDays(7) the the current Sunday.
            System.out.println(sunday.format(DateTimeFormatter.ofLocalizedDate(FormatStyle.FULL)));
            sunday = sunday.plus(Period.ofDays(7));
        } while (sunday.getYear() == year);
    }

输出是

Sunday, January 5, 2020
Sunday, January 12, 2020
Sunday, …