How to create a one-dimensional array of strings filled with random characters. Each line has a length of 5.

Closed due to the fact that the issue is too general for the participants Wiktor Stribiżew , Denis Bubnov , rjhdby , ermak0ff , Vadizar 4 Mar '17 at 10:54 .

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  • one
    Generate char s (aka short ) using Math.random , concatenate, ???, PROFIT !!! - Andrey M
  • @AndreyM, too simple. It is necessary to make an array in which, apart from 5-character strings, there is definitely nothing) - vp_arth

2 answers 2

It generates random five-character strings from characters with codes 33 through 126. There is further DEL, so it would have to do other processing for large codes.

At each iteration, we generate a random number from 33 to 126, cast to char and create a character by code. So 5 times. Using StringBuilder, we collect a string.

 public static void main(String[] args) { Scanner in = new Scanner(System.in); int STR_LENGTH = 5; System.out.println("Введите количество случайных строк"); int n = in .nextInt(); String[] arr = new String[n]; Random r = new Random(); for (int i = 0; i < n; i++) { StringBuilder builder = new StringBuilder(); for (int j = 0; j < STR_LENGTH; j++) { char code = (char) (r.nextInt(94) + 33); builder.append(Character.toString(code)); } arr[i] = builder.toString(); } System.out.println(Arrays.toString(arr)); }

    another option: you can use the Java Stream API

      char[] chars = IntStream.rangeClosed('А', 'я') // указываем диапазок символов, тут весь русский алфавит .mapToObj(c -> "" + (char) c) .collect(Collectors.joining()).toCharArray(); // собираем в массив String res = new Random().ints(5, 0, chars.length) // рандомно выбираем 5 чисел от 0 до 64 .mapToObj(i -> String.valueOf(chars[i])). // берем значение из массива collect(Collectors.joining(", ")); // склеиваем через " ," System.out.println(res);

    result

     У, й, а, Я, Р х, Л, е, в, Щ
    • The length of the chars array is not 66 , but 64 , so there’s not the whole alphabet - it’s worth fixing it in the comments to the code. You can also shorten the code using int[] charCodes = IntStream.rangeClosed('А', 'я').toArray(); , but this is an amateur. - Regent
    • thank. did not check the length - Senior Pomidor
    • one
      Good result turned out. - Nick Volynkin ♦