How do I get all Sundays of the year in Java?

You need the create a holiday calendar for your application. One of the functionality is to include all Sundays of the year as a holiday for your calendar. The following code snippet will show you how to get all Sundays of the given year. First we need to find the first Sunday of the year using the first 3 lines of code in the main() method. After getting the first Sunday we just need to loop to add 7 days using the Period.ofDays() to the current Sunday to get the next Sunday. We stop the loop when the year of the Sunday is different to the current year.

package org.kodejava.example.datetime;

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.Month;
import java.time.Period;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;

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

public class FindAllSundaysOfTheYear {
    public static void main(String[] args) {
        // Create a LocalDate object that represent the first day of the year.
        int year = 2020;
        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);
    }
}

The output of this code snippet are:

Sunday, January 5, 2020
Sunday, January 12, 2020
Sunday, January 19, 2020
Sunday, January 26, 2020
Sunday, February 2, 2020
Sunday, February 9, 2020
Sunday, February 16, 2020
Sunday, February 23, 2020
...
Sunday, December 6, 2020
Sunday, December 13, 2020
Sunday, December 20, 2020
Sunday, December 27, 2020

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