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()
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