MonthDay query() method in Java with Examples

query() method of an MonthDay class used to query this MonthDay using the specified query as parameter.The TemporalQuery object passed as parameter define the logic to be used to obtain the result from this MonthDay.

Syntax:

public <R> R query(TemporalQuery<R> query)

Parameters: This method accepts only one parameter query which is the query to invoke.

Return value: This method returns the query result, null may be returned.

Exception: This method throws following Exceptions:

• DateTimeException – if unable to query .
• ArithmeticException – if numeric overflow occurs.

Below programs illustrate the query() method:

Program 1:

// Java program to demonstrate
// MonthDay.query() method

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

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

        // create MonthDay object
        MonthDay lt
            = MonthDay.parse("--12-09");

        // apply query method of MonthDay class
        String value
            = lt.query(
                    TemporalQueries.chronology())
                  .toString();

        // print the result
        System.out.println("chronology value"
                           + " for MonthDay is "
                           + value);
    }
}

Output:

chronology value for MonthDay is ISO

Program 2: Showing if query did not found the required object then it returns null.

// Java program to demonstrate
// MonthDay.query() method

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

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

        // create MonthDay object
        MonthDay lt
            = MonthDay.parse("--12-07");

        // apply query method of MonthDay class
        // print the result
        System.out.println("offset value"
                           + " for MonthDay is "
                           + lt.query(
                                 TemporalQueries.offset()));
    }
}

Output:

offset value for MonthDay is null

References: https://docs.oracle.com/javase/10/docs/api/java/time/MonthDay.html#query(java.time.temporal.TemporalQuery)