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