DayOfWeek adjustInto() method in Java with Examples

The adjustInto() method of java.time.DayOfWeek is an in-built function in Java which takes a Temporal object specifying a date and returns a new Temporal object of the same observable type as the input with the day-of-week changed to be the same as specified DayOfWeek constant. Note that this method adjusts forwards or backwards within a Monday to Sunday week.

Method Declaration:

 public Temporal adjustInto(Temporal temporal)

Syntax:



 Temporal newLocalDate = DayOfWeek.ANYWEEKDAY.adjustInto(Temporal temporal)

Parameters: This method takes temporal as parameter where:

  • temporal – is the specified date to be adjusted.
  • ANYWEEKDAY – is the specified day to which the date is to be adjusted, e.g., MONDAY, TUESDAY, etc.
  • newLocalDate – is the modified date.
  • Return Value: The function returns an adjusted Temporal object which is the date adjusted according to specified Day of the Week.

    Below programs illustrate the above method:
    Program 1:

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    import java.time.*;
    import java.time.DayOfWeek;
    import java.time.temporal.Temporal;
      
    class DayOfWeekExample {
        public static void main(String[] args)
        {
            // Set a Local Date whose day is found
            LocalDate localDate1
                = LocalDate.of(1947, Month.AUGUST, 15);
      
            // Find the day from the Local Date
            DayOfWeek dayOfWeek1
                = DayOfWeek.from(localDate1);
      
            // Printing the Local Date
            System.out.println(localDate1
                               + " which is "
                               + dayOfWeek1.name());
      
            // Adjust the Date to Monday from Friday
            Temporal localDate2
                = DayOfWeek.MONDAY
                      .adjustInto(localDate1);
      
            // Find the day from the new Local date
            DayOfWeek dayOfWeek2
                = DayOfWeek.from(localDate2);
      
            // Printing the new Local Date
            System.out.println(localDate2
                               + " which is "
                               + dayOfWeek2.name());
        }
    }

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    Output:

    1947-08-15 which is FRIDAY
    1947-08-11 which is MONDAY
    

    Program 2:

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    import java.time.*;
    import java.time.DayOfWeek;
    import java.time.temporal.Temporal;
      
    class DayOfWeekExample {
        public static void main(String[] args)
        {
            // Set a Local Date whose day is found
            LocalDate localDate1
                = LocalDate.of(2019, Month.MARCH, 18);
      
            // Find the day from the Local Date
            DayOfWeek dayOfWeek1
                = DayOfWeek.from(localDate1);
      
            // Printing the Local Date
            System.out.println(localDate1
                               + " which is "
                               + dayOfWeek1.name());
      
            // Adjust the Date to Wednesday from Monday
            Temporal localDate2
                = DayOfWeek.WEDNESDAY
                      .adjustInto(localDate1);
      
            // Find the day from the new Local date
            DayOfWeek dayOfWeek2
                = DayOfWeek.from(localDate2);
      
            // Printing the new Local Date
            System.out.println(localDate2
                               + " which is "
                               + dayOfWeek2.name());
        }
    }

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    Output:

    2019-03-18 which is MONDAY
    2019-03-20 which is WEDNESDAY
    

    Reference: https://docs.oracle.com/javase/8/docs/api/java/time/DayOfWeek.html#adjustInto-java.time.temporal.Temporal-



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