The toNanos() method of Duration Class in java.time package is used get the value of this duration in number of nano-seconds.
Syntax:
public long toNanos()
Parameters: This method do not accepts any parameter.
Return Value: This method returns a long value which is the number of nano-seconds in this duration.
Below examples illustrate the Duration.toNanos() method:
Example 1:
// Java code to illustrate toNanos() method  import java.time.Duration;  public class GFG {    public static void main(String[] args)    {          // Duration using parse() method        Duration duration            = Duration.parse("P2DT3H4M");          System.out.println("Duration: "                           + duration);          // Get the number of nano-seconds        // using toNanos() method        System.out.println(duration.toNanos());    }} |
Output:
Duration: PT51H4M 183840000000000
Example 2:
// Java code to illustrate toNanos() method  import java.time.Duration;  public class GFG {    public static void main(String[] args)    {          // Duration using ofNanos() method        Duration duration            = Duration.ofNanos(10);          System.out.println("Duration: "                           + duration);          // Get the number of nano-seconds        // using toNanos() method        System.out.println(duration.toNanos());    }} |
Output:
Duration: PT0.00000001S 10
Reference: https://docs.oracle.com/javase/9/docs/api/java/time/Duration.html#toNanos–
