The firstDayOfYear() is a built-in method of the Month ENUM which is used to get the day of year corresponding to the first day of this month.
Syntax:
public int firstDayOfYear(boolean leapYear)
Parameters: This method accepts a single parameter leapYear, which is a boolean flag variable indicating whether this Year is a leap year or not.
Return Value: This method returns the day-of-year corresponding to the first day of this month.
Below programs illustrate the above method:
Program 1:
import java.time.*;import java.time.Month;import java.time.temporal.Temporal;  class DayOfWeekExample {    public static void main(String[] args)    {        // Set the month to february        Month month = Month.of(2);          // Get corresponding day-of-year of the        // first day of february in a non-leap year        System.out.println(month.firstDayOfYear(false));    }} |
Output:
32
Program 2:
import java.time.*;import java.time.Month;import java.time.temporal.Temporal;  class DayOfWeekExample {    public static void main(String[] args)    {        // Set the month to february        Month month = Month.of(3);          // Get corresponding day-of-year of the        // first day of March in a leap year        System.out.println(month.firstDayOfYear(true));    }} |
Output:
61
Reference: https://docs.oracle.com/javase/8/docs/api/java/time/Month.html#firstDayOfYear-boolean-
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