LocalDate query() Method in Java with Examples

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

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:

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// Java program to demonstrate
// LocalDate.query() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create LocalDate object
        LocalDate ld = LocalDate.parse("2018-12-31");
  
        // apply query method of LocalDate class
        String value
            = ld.query(TemporalQueries.precision())
                  .toString();
  
        // print the result
        System.out.println("Precision value for LocalDate is "
                           + value);
    }
}

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Output:

Precision value for LocalDate is Days

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

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// Java program to demonstrate
// LocalDate.query() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create LocalDate object
        LocalDate ld = LocalDate.parse("2018-12-31");
  
        // apply query method of LocalDate class
        // print the result
        System.out.println("Zone value for LocalDate is "
                           + ld.query(
                                 TemporalQueries.offset()));
    }
}

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Output:

Zone value for LocalDate is null

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



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