WeekFields weekOfYear() method in Java with Examples

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The weekOfYear() method of WeekFields class is used to return a field to access the week of year based on this WeekFields.
Example:

if the 1st day of the year is a Monday, week one starts on the 1st and there is no week zero
if the 2nd day of the year is a Monday, week one starts on the 2nd and the 1st is in week zero
if the 4th day of the year is a Monday, week one starts on the 4th and the 1st to 3rd is in week zero
if the 5th day of the year is a Monday, week two starts on the 5th and the 1st to 4th is in week one

This field can be used with any calendar system.

Syntax:

public TemporalField weekOfYear()

Parameters: This method accepts nothing.

Return value: This method returns a field providing access to the week-of-year, not null.

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

// Java program to demonstrate
// WeekFields.weekOfYear() 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 weekOfYear()
        TemporalField weekOfYear
            = weekFields.weekOfYear();
  
        // create a LocalDate
        LocalDate day
            = LocalDate.of(2021, 12, 21);
  
        // get week of year for localdate
        int wow = day.get(weekOfYear);
  
        // print results
        System.out.println("Week of year for "
                           + day + " :" + wow);
    }
}

Output:

Week of year for 2021-12-21 :52

Program 2:

// Java program to demonstrate
// WeekFields.weekOfYear() 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 weekOfYear()
        TemporalField weekOfYear
            = weekFields.weekOfYear();
  
        // create a LocalDate
        LocalDate day = LocalDate.of(2014, 10, 12);
  
        // get week of year for localdate
        int wow = day.get(weekOfYear);
  
        // print results
        System.out.println("Week of year for "
                           + day + " :" + wow);
    }
}