YearMonth withMonth() method in Java with Examples

withMonth(int month) method of the YearMonth class used to alter the month-of-year of YearMonth object using month passed as a parameter and after that method returns the copy of altered YearMonth.If the day-of-month is invalid for the specified month, the day will be adjusted to the last valid day-of-month. This instance is immutable and unaffected by this method call.

Syntax:

public YearMonth withMonth(int month)

Parameters: This method accepts month as parameter which is the month-of-year to set in the returned year-month, from 1 (January) to 12 (December).

Return value: This method returns a YearMonth based on this year-month with the requested month.

Exception: This method throws DateTimeException if the month-of-year value is invalid.

Below programs illustrate the withMonth() method:
Program 1:

// Java program to demonstrate
// YearMonth.withMonth() method

import java.time.*;
import java.time.temporal.*;

public class GFG {
    public static void main(String[] args)
    {

        // create a YearMonth object
        YearMonth yr
            = YearMonth.of(2019, 12);

        // print instance
        System.out.println("YearMonth before"
                           + " applying method: "
                           + yr);

        // apply withMonth method of YearMonth class
        YearMonth updatedlocal = yr.withMonth(1);

        // print instance
        System.out.println("YearMonth after"
                           + " applying method: "
                           + updatedlocal);
    }
}

Output:

YearMonth before applying method: 2019-12
YearMonth after applying method: 2019-01

Program 2:

// Java program to demonstrate
// YearMonth.withMonth() method

import java.time.*;
import java.time.temporal.*;

public class GFG {
    public static void main(String[] args)
    {

        // create a YearMonth object
        YearMonth yr
            = YearMonth.of(2022, 7);

        // print instance
        System.out.println("YearMonth before"
                           + " applying method: "
                           + yr);

        // apply withMonth method of YearMonth class
        YearMonth updatedlocal = yr.withMonth(12);

        // print instance
        System.out.println("YearMonth after"
                           + " applying method: "
                           + updatedlocal);
    }
}

Output:

YearMonth before applying method: 2022-07
YearMonth after applying method: 2022-12

References: https://docs.oracle.com/javase/10/docs/api/java/time/YearMonth.html#withMonth(int)