WeekFields weekOfYear() method in Java with Examples

Last Updated : 29 Jan, 2020
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 
// 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 
// 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);
    }
}
Output: 
Week of year for 2014-10-12 :42
References: https://docs.oracle.com/javase/10/docs/api/java/time/temporal/WeekFields.html#weekOfYear()
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