WeekFields weekOfYear() method in Java with Examples

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); 

    } 
}