Shuffle an array in kotlin

Kotlin program for Shuffle an array. Here problem description and other solutions.

/*
  Kotlin program for
  Shuffle the array elements
*/
class Shuffling
{
	// Function which is swapping two array elements 
	// of given location
	fun swapElement(arr: Array < Int > , i: Int, j: Int): Unit
	{
		// Get i location element
		val temp: Int = arr[i];
		// Set new values
		arr[i] = arr[j];
		arr[j] = temp;
	}
	// Returns the random location of array elements
	fun randomLocation(min: Int, max: Int): Int
	{
		// Calculate random number between given range
		return min + (Math.random() * (max - min)).toInt();
	}
	// Function which is shuffle given array elements
	fun shuffleElement(arr: Array < Int > , size: Int): Unit
	{
		// (i,j) indicate locations
		var j: Int ;
		var i: Int ;
		// Variable which is controlling the 
		// execution process of loop
		var counter: Int = 0;
		// Loop which is shuffling random elements in array
		while (counter < size)
		{
			// Get random location of array index
			i = this.randomLocation(0, size);
			j = this.randomLocation(0, size);
			if (i != j)
			{
				// Swap array elements
				this.swapElement(arr, i, j);
				counter += 1;
			}
		}
	}
	// Function which is display array elements
	fun display(arr: Array < Int > , size: Int): Unit
	{
		var i: Int = 0;
		while (i < size)
		{
			// Disply element value
			print("  " + arr[i]);
			i += 1;
		}
		print("\n");
	}
}
fun main(args: Array < String > ): Unit
{
	val task: Shuffling = Shuffling();
	// Define array of integer elements
	val arr: Array < Int > = arrayOf(1, 0, -3, 8, 7, 3, 9, 4, 2, 5, 10, 6);
	val size: Int = arr.count();
	// Before shuffling  array elements
	println(" Initial array elements");
	task.display(arr, size);
	println(" After Shuffle array elements");
	task.shuffleElement(arr, size);
	task.display(arr, size);
	task.shuffleElement(arr, size);
	task.display(arr, size);
	task.shuffleElement(arr, size);
	task.display(arr, size);
}

Output

 Initial array elements
  1  0  -3  8  7  3  9  4  2  5  10  6
 After Shuffle array elements
  9  2  4  1  3  7  6  5  0  8  10  -3
  10  3  4  1  5  2  6  7  8  9  0  -3
  2  8  10  -3  5  1  3  7  6  9  0  4