LocalDate isSupported() method in Java with Examples

In LocalDate class, there are two types of isSupported() method depending upon the parameters passed to it.

isSupported(TemporalField field)

isSupported() method of a LocalDate class used to check if the specified field is supported by LocalDate class or not means using this method we can check if this LocalDate can be queried for the specified field.

The supported fields of ChronoField are:

• DAY_OF_WEEK
• ALIGNED_DAY_OF_WEEK_IN_MONTH
• ALIGNED_DAY_OF_WEEK_IN_YEAR
• DAY_OF_MONTH
• DAY_OF_YEAR
• EPOCH_DAY
• ALIGNED_WEEK_OF_MONTH
• ALIGNED_WEEK_OF_YEAR
• MONTH_OF_YEAR
• PROLEPTIC_MONTH
• YEAR_OF_ERA
• YEAR
• ERA

All other ChronoField instances will return false.

Syntax:

public boolean isSupported(TemporalField field)

Parameters: This method accepts one single parameter field which is the field to check.

Return value: This method returns boolean value true if the field is supported on this LocalDate, false if not.

Below programs illustrate the isSupported() method:

Program 1:

// Java program to demonstrate
// LocalDate.isSupported() method

import java.time.*;
import java.time.temporal.ChronoField;

public class GFG {
    public static void main(String[] args)
    {

        // create a LocalDate object
        LocalDate lt
            = LocalDate.parse("2018-11-03");

        // check YEAR_OF_ERA is supported in LocalDate
        boolean value
            = lt.isSupported(ChronoField.YEAR_OF_ERA);

        // print result
        System.out.println("YEAR_OF_ERA Field is supported: "
                           + value);
    }
}

Output:

YEAR_OF_ERA Field is supported: true

isSupported(TemporalUnit unit)

isSupported() method of a LocalDate class used to Check if the specified unit is supported by LocalDate class or not means using this method we can check if this LocalDate can be queried for the specified unit.

The supported fields of ChronoUnit are:

• DAYS
• WEEKS
• MONTHS
• YEARS
• DECADES
• CENTURIES
• MILLENNIA
• ERAS

All other ChronoUnit instances will return false.

Syntax:

public boolean isSupported(TemporalUnit unit)

Parameters: This method accepts one single parameter unit which is the unit to check.

Return value: This method returns boolean value true if the field is supported on this LocalDate, false if not.

Below programs illustrate the isSupported() method:

Program 1:

// Java program to demonstrate
// LocalDate.isSupported() method

import java.time.*;
import java.time.temporal.ChronoUnit;

public class GFG {
    public static void main(String[] args)
    {

        // create a LocalDate object
        LocalDate lt
            = LocalDate.parse("2018-12-29");

        // check CENTURIES ChronoUnit supported in LocalDate
        boolean value
            = lt.isSupported(ChronoUnit.CENTURIES);

        // print result
        System.out.println("ChronoUnit CENTURIES is  supported: "
                           + value);
    }
}

Output:

ChronoUnit CENTURIES is  supported: true

Reference: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDate.html#isSupported(java.time.temporal.TemporalField), https://docs.oracle.com/javase/10/docs/api/java/time/LocalDate.html#isSupported(java.time.temporal.TemporalUnit)