WeekFields getFirstDayOfWeek() method in Java with Examples

Last Updated : 29 Jan, 2020
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 
// 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 
// 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()
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