The dayOfWeek() method of WeekFields class is used to return a field to access the day of the week based on this WeekFields. For example, if the first day-of-week is Monday, then that will have the value 1, with other days ranging from Tuesday as 2 to Sunday as 7.
Syntax:
public TemporalField dayOfWeek()
Parameters: This method accepts nothing.
Return value: This method returns a field providing access to the day-of-week with localized numbering, not null.
Below programs illustrate the WeekFields.dayOfWeek() method:
Program 1:
// Java program to demonstrate// WeekFields.dayOfWeek() method  import java.time.DayOfWeek;import java.time.LocalDate;import java.time.temporal.TemporalField;import java.time.temporal.WeekFields;  public class GFG {    public static void main(String[] args)    {          // create WeekFields        WeekFields weekFields            = WeekFields.of(DayOfWeek.MONDAY, 1);          // apply dayOfWeek()        TemporalField dayOfWeek            = weekFields.dayOfWeek();          // create a LocalDate        LocalDate day = LocalDate.of(2021, 12, 21);          // get day of week for localdate        int dow = day.get(dayOfWeek);          // print results        System.out.println("day of week for "                           + day + " :" + dow);    }} |
Output:
day of week for 2021-12-21 :2
Program 2:
// Java program to demonstrate// WeekFields.dayOfWeek() method  import java.time.DayOfWeek;import java.time.LocalDate;import java.time.temporal.TemporalField;import java.time.temporal.WeekFields;  public class GFG {    public static void main(String[] args)    {          // create WeekFields        WeekFields weekFields            = WeekFields.of(DayOfWeek.SUNDAY, 1);          // apply dayOfWeek()        TemporalField dayOfWeek            = weekFields.dayOfWeek();          // create a LocalDate        LocalDate day            = LocalDate.of(2018, 05, 31);          // get day of week for localdate        int dow = day.get(dayOfWeek);          // print results        System.out.println("day of week for "                           + day + " :" + dow);    }} |
Output:
day of week for 2018-05-31 :5
References: https://docs.oracle.com/javase/10/docs/api/java/time/temporal/WeekFields.html#dayOfWeek()
