Java- Measuring Iteration time using nanoTime

MeasureTime.java

import java.io.*;
import java.util.*;

class MeasureTime
{
  public static void main (String[] args)
  {

	for (int i=1;i<100;i++)
	{
	  long start_time;
     	  long execution_time;
	  randomArray ra = new randomArray();

	  start_time = System.nanoTime();

	  for (int x=0;x<100;x++)
	    {
	      int[] test = ra.randomArray(100);
	    }

      execution_time = System.nanoTime() - start_time;
      System.out.println(execution_time);
    }

   }







}

randomArray.java

import java.util.*;


public class randomArray
{

  //Constructor takes the integer arguement as the desired length of an array
  //The array is randomly occupied with values from 0-100
  //The array is returned to be outputted in a separate method
  public static int[] randomArray(int arrayLen)
  {

	//Creates array of length [passed in value]
	int[] randArr;
    randArr = new int[arrayLen];

    //Creates random number generator
    Random randomGenerator = new Random();

    //Occupies objects in array with values 0-100 using the random number generator
    for(int i=0; i<(arrayLen-1); i++)
	{
	  int randx = randomGenerator.nextInt(100);
	  randArr[i] = randx;
    }

	//Generated array is returned
    return randArr;

  }


 //Method passes a user inputed integer into the constructor
 //The created array is outputted to the terminal
 public static int[] resultOutput()
 {

	 //Asks for user input and converts it from a string to an integer
     Scanner user_input = new Scanner(System.in);
     System.out.println("Please enter your chosen variable length:\n");
     String chosenLenString = user_input.next();
     int chosenLenInt = Integer.parseInt(chosenLenString);

     //Integer is passed into the constuctor to generate the array
	 int[] resultArr = randomArray(chosenLenInt);

	 //Array is outputted to the terminal
	 System.out.println("An array of length " + chosenLenString + "=\n" + Arrays.toString(resultArr));

	 return resultArr;
 }

  public static void main (String[] args)
  {
	resultOutput();

  }

}