ChronoField enum implements the TemporalField interface and provides several constants to represent fields in a datetime.
ChronoField enum contains a long list of constants. Some of them are as follows:
AMPM_OF_DAY, CLOCK_HOUR_OF_AMPM, CLOCK_HOUR_OF_DAY, DAY_OF_MONTH, DAY_OF_WEEK, DAY_OF_YEAR, ERA, HOUR_OF_AMPM, HOUR_OF_DAY, INSTANT_SECONDS, MINUTE_OF_HOUR, MONTH_OF_YEAR, SECOND_OF_MINUTE, YEAR, YEAR_OF_ERA.
The following code demonstrates how to use a ChronoField to extract a field value from a datetime and whether the datetime supported the field:
import java.time.LocalDate; import java.time.LocalDateTime; import java.time.temporal.ChronoField; public class Main { public static void main(String[] args) { LocalDateTime now = LocalDateTime.now(); System.out.println("Current Date Time: " + now); System.out.println("Year: " + now.get(ChronoField.YEAR)); System.out.println("Month: " + now.get(ChronoField.MONTH_OF_YEAR)); System.out.println("Day: " + now.get(ChronoField.DAY_OF_MONTH)); System.out.println("Hour-of-day: " + now.get(ChronoField.HOUR_OF_DAY)); System.out.println("Hour-of-AMPM: " + now.get(ChronoField.HOUR_OF_AMPM)); System.out.println("AMPM-of-day: " + now.get(ChronoField.AMPM_OF_DAY)); LocalDate today = LocalDate.now(); System.out.println("Current Date : " + today); System.out.println("LocalDate supports year: " + today.isSupported(ChronoField.YEAR)); System.out.println("LocalDate supports hour-of-day: " + today.isSupported(ChronoField.HOUR_OF_DAY)); System.out.println("Year is supported by LocalDate: " + ChronoField.YEAR.isSupportedBy(today)); System.out.println("Hour-of-day is supported by LocalDate: " + ChronoField.HOUR_OF_DAY.isSupportedBy(today)); }//from ww w . ja v a 2s .c o m }