Shuffle an array in scala

Scala program for Shuffle an array. Here more information.

/*
  Scala program for
  Shuffle the array elements
*/
class Shuffling()
{
	// Function which is swapping two array elements 
	// of given location
	def swapElement(arr: Array[Int], i: Int, j: Int): Unit = {
		// Get i location element
		var temp: Int = arr(i);
		// Set new values
		arr(i) = arr(j);
		arr(j) = temp;
	}
	// Returns the random location of array elements
	def randomLocation(min: Int, max: Int): Int = {
		val r = new scala.util.Random;
        // Calculate random number between given range
        return min + r.nextInt((max-min)) ;
	}
	// Function which is shuffle given array elements
	def shuffleElement(arr: Array[Int], size: Int): Unit = {
		// (i,j) indicate locations
		var j: Int = 0;
		var i: Int = 0;
		// 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 = randomLocation(0, size);
			j = randomLocation(0, size);
			if (i != j)
			{
				// Swap array elements
				swapElement(arr, i, j);
				counter += 1;
			}
		}
	}
	// Function which is display array elements
	def display(arr: Array[Int], size: Int): Unit = {
		var i: Int = 0;
		while (i < size)
		{
			// Disply element value
			print("  " + arr(i));
			i += 1;
		}
		print("\n");
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: Shuffling = new Shuffling();
		// Define array of integer elements
		var arr: Array[Int] = Array(
          1, 0, -3, 8, 7, 3, 9, 4, 2, 5, 10, 6);
		var size: Int = arr.length;
		// 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
  0  5  7  1  4  10  9  6  2  8  -3  3
  -3  0  8  6  3  4  9  1  10  5  7  2
  -3  6  2  7  0  8  10  1  9  5  3  4