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Instant query() Method in Java with Examples

  • Last Updated : 08 Jan, 2019

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

Syntax:

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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
// Instant.query() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create Instant object
        Instant instant
            = Instant.parse("2018-12-31T10:15:30.00Z");
  
        // apply query method of Instant class
        String value
            = instant.query(TemporalQueries.precision())
                  .toString();
  
        // print the result
        System.out.println("Precision value for Instant is "
                           + value);
    }
}
Output:
Precision value for Instant is Nanos

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




// Java program to demonstrate
// Instant.query() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create Instant object
        Instant instant
            = Instant.parse("2018-12-31T10:15:30.00Z");
  
        // apply query method of Instant class
        // print the result
        System.out.println("Zone value for Instant is "
                           + instant.query(TemporalQueries.offset()));
    }
}
Output:
Zone value for Instant is null

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




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