The isValidDay() method of YearMonth class in Java is used to check if this YearMonth object and a month-day represented by an integer provided as a parameter to the method together can form a valid date or not.
Syntax:
public boolean isValidDay(int monthDay)
Parameter: This method accepts a single parameter monthDay which represents a month-day which is need to be examined with this YearMonth object.
Return Value: It returns a boolean True value if this YearMonth object and the given month-day represented as an integer together can form a valid date otherwise it returns False.
Below programs illustrate the YearMonth.isValidDay() method in Java:
Program 1:
// Program to illustrate the isValidDay() method  import java.util.*;import java.time.*;  public class GfG {    public static void main(String[] args)    {        // Create YearMonth object        YearMonth yearMonth = YearMonth.of(2016, 2);          // Check if the day passed is valid        System.out.println(yearMonth.isValidDay(24));    }} |
true
Program 2: In the below program, Year is mentioned as 1990 which is not a leap year but month-day represents a leap year. So, they together can not form a valid date so the method will return false.
// Program to illustrate the isValidDay() method  import java.util.*;import java.time.*;  public class GfG {    public static void main(String[] args)    {        // Create YearMonth object        YearMonth yearMonth = YearMonth.of(1990, 2);          // Check if the day passed is valid        System.out.println(yearMonth.isValidDay(29));    }} |
false
Reference: https://docs.oracle.com/javase/8/docs/api/java/time/YearMonth.html#isValidDay-java.time.MonthDay-
