Generating Unique Random Elements in Java using RANDOM METHOD ALONE in java [closed]

public static void shuffle_deck(
    String[] card_number,
    String[] card_name) {
  Random generator = new Random();
  System.out.println("\nShuffled Deck: ");
  for (int i = 0; i < card_number.length; i++) {
    for (int j = 0; j < card_name.length; j++) {
      int randomIndextoSwap1 = generator.nextInt(card_number.length);
      String number_swap = card_number[randomIndextoSwap1];
      card_number[randomIndextoSwap1] = card_number[i];
      int randomIndexToSwap2 = generator.nextInt(card_name.length);
      String suit_swap = card_name[randomIndexToSwap2];
      card_name[randomIndexToSwap2] = card_name[j];
      System.out.println(card_number[i] + " OF " + card_name[j]);
    }
  }