The format() method of ChronoLocalDate interface in Java method formats this date using the specified formatter.
Syntax:
public String format(DateTimeFormatter formatter)
Parameter: This method accepts a parameter obj which specifies the formatter to be used and it is not null.
Exceptions: The function throws only DateTimeException which occurs during an error in printing.
Return Value: It returns the formatted date string and not null.
Below programs illustrate the format() method of ChronoLocalDate in Java:
Program 1:
// Program to illustrate the format() method  import java.util.*;import java.time.*;import java.time.chrono.*;import java.time.format.DateTimeFormatter;  public class GfG {    public static void main(String[] args)    {          // Parses the date        ChronoLocalDate dt            = LocalDate.parse("2018-11-01");        System.out.println(dt);          // Function call        DateTimeFormatter formatter            = DateTimeFormatter                  .ofPattern("dd/MM/YYYY");          System.out.println(formatter.format(dt));    }} |
Output:
2018-11-01 01/11/2018
Program 2: To illustrate the exception.
// Program to illustrate the format() method// Exception Program  import java.util.*;import java.time.*;import java.time.chrono.*;import java.time.format.DateTimeFormatter;  public class GfG {    public static void main(String[] args)    {        try {            // Parses the date            ChronoLocalDate dt                = LocalDate.parse("2018-01-32");            System.out.println(dt);              // Function call            DateTimeFormatter formatter                = DateTimeFormatter                      .ofPattern("dd/MM/YYYY");              System.out.println(formatter.format(dt));        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
java.time.format.DateTimeParseException: Text '2018-01-32' could not be parsed: Invalid value for DayOfMonth (valid values 1 - 28/31): 32
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