The adjustInto() method of java.time.Month ENUM 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 month replaced with this month-of-year.
Method Declaration:
public Temporal adjustInto(Temporal temporal)
Syntax:
Temporal newLocalDate = Month.ANYMONTH.adjustInto(Temporal temporal)
Parameters: This method takes temporal as parameter where:
- temporal – is the specified date to be adjusted.
- ANYMONTH – is the specified month to which the date is to be adjusted, e.g., JANUARY, FEBRUARY, etc.
- newLocalDate – is the modified date.
Return Value: The function returns an adjusted Temporal object which is the date adjusted according to specified Month.
Exceptions:
- DateTimeException: This method throws this exception if it is not possible to make the adjustment.
- ArithmeticException: This exception is thrown if numeric overflow occurs.
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 a Local Date whose month is found        LocalDate localDate1            = LocalDate.of(1947, Month.AUGUST, 15);          // Find the month from the Local Date        Month monthOfYear1            = Month.from(localDate1);          // Printing the Local Date        System.out.println(localDate1                           + " which is "                           + monthOfYear1.name());          // Adjust the month to JANUARY from AUGUST        Temporal localDate2            = Month.JANUARY                  .adjustInto(localDate1);          // Find the day from the new Local date        Month monthOfYear2            = Month.from(localDate2);          // Printing the new Local Date        System.out.println(localDate2                           + " which is "                           + monthOfYear2.name());    }} |
Output:
1947-08-15 which is AUGUST 1947-01-15 which is JANUARY
Program 2:
import java.time.*;import java.time.Month;import java.time.temporal.Temporal;  class DayOfWeekExample {    public static void main(String[] args)    {        // Set a Local Date whose month is found        LocalDate localDate1            = LocalDate.of(2019, Month.MARCH, 18);          // Find the month from the Local Date        Month monthOfYear1            = Month.from(localDate1);          // Printing the Local Date        System.out.println(localDate1                           + " which is "                           + monthOfYear1.name());          // Adjust the month to December from March        Temporal localDate2            = Month.DECEMBER                  .adjustInto(localDate1);          // Find the day from the new Local date        Month monthOfYear2            = Month.from(localDate2);          // Printing the new Local Date        System.out.println(localDate2                           + " which is "                           + monthOfYear2.name());    }} |
Output:
2019-03-18 which is MARCH 2019-12-18 which is DECEMBER
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