The getLong() method of ChronoLocalDateTime interface in Java is used to get the value of the specified field passed as input from this ChronoLocalDateTime as an long value.This method queries this ChronoLocalDateTime for the value of the field and the returned value will always be within the valid range of values for the field. When the field is not supported and the method is unable to return int value then an exception is thrown.
Syntax:
long getLong(TemporalField field)
Parameters: This method accepts a single parameter field which represents the field to get. This is a mandatory parameter and it should not be null.
Return value: This method returns an int value for the field.
Exception: This method throws following exceptions:
- DateTimeException: if a value for the field cannot be obtained or the value is outside the range of valid values for the field.
- UnsupportedTemporalTypeException: if the field is not supported or the range of values exceeds an int.
- ArithmeticException: if numeric overflow occurs.
Below programs illustrate the getLong() method:
Program 1:
// Java program to demonstrate// ChronoLocalDateTime.getLong() method import java.time.*;import java.time.chrono.*;import java.time.temporal.ChronoField; public class GFG { public static void main(String[] args) { // create a ChronoLocalDateTime object ChronoLocalDateTime localDT = LocalDateTime .parse("2019-12-31T19:15:30"); // get all enum of chronofield // and iterate through all enum values for (ChronoField field : ChronoField.values()) { try { // get long value of field long value = localDT.getLong(field); System.out.println(field + " : " + value); } catch (Exception e) { System.out.println("e " + field); } } }} |
NanoOfSecond : 0 NanoOfDay : 69330000000000 MicroOfSecond : 0 MicroOfDay : 69330000000 MilliOfSecond : 0 MilliOfDay : 69330000 SecondOfMinute : 30 SecondOfDay : 69330 MinuteOfHour : 15 MinuteOfDay : 1155 HourOfAmPm : 7 ClockHourOfAmPm : 7 HourOfDay : 19 ClockHourOfDay : 19 AmPmOfDay : 1 DayOfWeek : 2 AlignedDayOfWeekInMonth : 3 AlignedDayOfWeekInYear : 1 DayOfMonth : 31 DayOfYear : 365 EpochDay : 18261 AlignedWeekOfMonth : 5 AlignedWeekOfYear : 53 MonthOfYear : 12 ProlepticMonth : 24239 YearOfEra : 2019 Year : 2019 Era : 1 e InstantSeconds e OffsetSeconds
Program 2:
// Java program to demonstrate// ChronoLocalDateTime.getLong() method import java.time.*;import java.time.chrono.*;import java.time.temporal.ChronoField; public class GFG { public static void main(String[] args) { // create a ChronoLocalDateTime object ChronoLocalDateTime localDT = LocalDateTime .parse("2018-10-25T23:12:31.123"); // try to find AMPM_OF_DAY // using ChronoField.AMPM_OF_DAY // in getLong method try { long value = localDT.getLong( ChronoField.AMPM_OF_DAY); // print result System.out.println("AMPM_OF_DAY value: " + value); } catch (Exception e) { // print exception System.out.println("Exception: " + e); } }} |
AMPM_OF_DAY value: 1
