Calculate process elapsed time : Runtime « Development Class « Java

Calculate process elapsed time

public class Main {
  public static void main(String[] args) {
    long start = System.nanoTime();
    System.out.println("Start: " + start);

    for (int i = 0; i < 100; i++) {
      for (int j = 0; j < 100; j++) {

    long end = System.nanoTime();
    System.out.println("End  : " + end);

    long elapsedTime = end - start;

    System.out.println(elapsedTime + " nano seconds");


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