java calculate elapsedTime

To calculate the elapsed time in Java, you can use the 'Instant' class of the 'java.time' library. The 'Instant' class represents a specific point in time measured as the number of nanoseconds since the beginning of the Unix Era (January 1, 1970). You can get the current time by using the static 'now' method of the 'Instant' class, and then calculate the difference between the current time and a previous instant to get the elapsed time.

Here is an example of how to calculate the elapsed time using the 'Instant' class:

import java.time.Duration;
import java.time.Instant;

public class Main {
  public static void main(String[] args) {
    // Stores the current instant
    Instant beginning = Instant.now();

    // Run some code here...

    // Stores the current instant again
    Instant ending = Instant.now();

    // Calculates the difference between the two moments
    Duration delta = Duration.between(beginning, ending);

    // Prints elapsed time in seconds
    System.out.println(delta.getSeconds());
  }
}

This code gets the current instant twice, once before and again after executing the code that wants to measure time. It then uses the static 'between' method of the 'Duration' class to calculate the difference between the two instants and stores the result in a 'delta' variable. Finally, it prints the elapsed time in seconds using the m