JAVA EE: How to use isSupported method of Instant class

Wednesday, 11 April 2018

How to use isSupported method of Instant class | Java 8 Date and Time

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InstantDemo1.java

import java.time.Instant;

import java.time.temporal.ChronoField;

public class InstantDemo1

{

    public static void main(String[] args)

    {

         Instant instant = Instant.parse("2014-12-03T10:15:30.00Z");

        /*

         * Parameters:

         * 

         * field - the field to check, null returns false

         * 

         * Returns:

         * 

         * true if the field is supported on this instant, false if

         * not

         */

         System.out.println(instant.isSupported(ChronoField.NANO_OF_SECOND));

         System.out.println(instant.isSupported(ChronoField.DAY_OF_MONTH));

    }

}

Output

true

false

InstantDemo2.java

import java.time.Instant;

import java.time.temporal.ChronoUnit;

public class InstantDemo2

{

    public static void main(String[] args)

    {

        Instant instant = Instant.parse("2014-12-03T10:15:30.00Z");

        /*

         * Parameters:

         * 

         * unit - the unit to check, null returns false

         * 

         * Returns:

         * 

         * true if the unit can be added/subtracted, false if not

         */

        System.out.println(instant.isSupported(ChronoUnit.DAYS));

        System.out.println(instant.isSupported(ChronoUnit.WEEKS));

    }

}