List<String> cards = new ArrayList<>(List.of("A", "K", "Q", "J", "10"));
Collections.shuffle(cards);

System.out.println(cards); // [Q, 10, J, A, K]

Random rnd = new Random(42);
Collections.shuffle(cards, rnd);

System.out.println(cards); // [J, K, 10, A, Q]

String line = "-".repeat(10);
System.out.println(line); // ----------

String block = "Hi ".repeat(3);
System.out.println(block); // Hi Hi Hi