How to shuffle an array in java?

Question:

How to shuffle an array in java?

Code:

import java.util.*;
 
public class ShuffleCards {
   public static void main(String[] args) {
 
      Random r = new Random();
      int[] cards = new int[10];
 
      // Initialize the array to the ints 0-51
      for (int i=0; i < cards.length; i++) {
        cards[i] = i;
      }
 
      // print out contents of array
      System.out.println(Arrays.toString(cards));
 
      // Shuffle by exchanging each element randomly
      for (int i=0; i < cards.length; i++) {
         int pos = r.nextInt(cards.length);
         int temp = cards[i];
         cards[i] = cards[pos];
         cards[pos] = temp;
      }
 
      // print out contents of array
      System.out.println(Arrays.toString(cards));
 
   }
}

Output:

$ java ShuffleCards
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
[1, 2, 3, 4, 9, 7, 8, 5, 0, 6]