Read integers separated with whitespace into int[] array

Question

I read line with

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
reader.readLine();

Example input is

Answer 1

You could pre-compiled regex Pattern also to split String.

    Pattern pattern = Pattern.compile("(\\d+)\\s+"); //$NON-NLS-1$
    Matcher matcher = pattern.matcher(line);
    List numbers = new LinkedList();

    while (matcher.find()) {
        numbers.add(Integer.valueOf(matcher.group(1)));
    }
    Integer[] output = numbers.toArray(new Integer[numbers.size()]);

Or you could also use pattern.split directly

    Pattern pattern = Pattern.compile("(\\d+)"); //$NON-NLS-1$
    String[] numberAsString = pattern.split(line);
    int[] numbers = new int[numberAsString.length];
    for (int i = 0; i < numberAsString.length; i++) {
        numbers[i] = Integer.valueOf(numberAsString[i]).intValue();
    }

Gotta love regex :D