WeekFields getFirstDayOfWeek() method in Java with Examples

The getFirstDayOfWeek() method of WeekFields class is used to return the first day-of-week as a DayOfWeek enum.For example, the US uses Sunday, while France uses Monday.

Syntax:

public DayOfWeek getFirstDayOfWeek()

Parameters: This method accepts nothing.

Return value: This method returns the first day-of-week, not null.

Below programs illustrate the WeekFields.getFirstDayOfWeek() method:
Program 1:

// Java program to demonstrate
// WeekFields.getFirstDayOfWeek() method

import java.time.DayOfWeek;
import java.time.temporal.WeekFields;

public class GFG {
    public static void main(String[] args)
    {

        // create WeekFields
        WeekFields weekFields
            = WeekFields.of(DayOfWeek.MONDAY, 1);

        // apply getFirstDayOfWeek()
        DayOfWeek firstDay
            = weekFields.getFirstDayOfWeek();

        // print results
        System.out.println("First Day:"
                           + firstDay);
    }
}

Output:

First Day:MONDAY

Program 2:

// Java program to demonstrate
// WeekFields.getFirstDayOfWeek() method

import java.time.DayOfWeek;
import java.time.temporal.WeekFields;
import java.util.Locale;

public class GFG {
    public static void main(String[] args)
    {

        Locale locale = new Locale("EN", "US");

        // create WeekFields
        WeekFields weekFields
            = WeekFields.of(locale);

        // apply getFirstDayOfWeek()
        DayOfWeek firstDay
            = weekFields.getFirstDayOfWeek();

        // print results
        System.out.println("First Day:"
                           + firstDay);
    }
}

Output:

First Day:SUNDAY

References: https://docs.oracle.com/javase/10/docs/api/java/time/temporal/WeekFields.html#getFirstDayOfWeek()