How to get list of Integer from String

Question

my string contains Integer separated by space:

String number = "1 2 3 4 5 "

How I can get list of Integer from this string ?

Answer 1

You can use a Scanner to read the string one integer at a time.

Scanner scanner = new Scanner(number);
List<Integer> list = new ArrayList<Integer>();
while (scanner.hasNextInt()) {
    list.add(scanner.nextInt());
}

Answer 2

Using Java8 Stream API map and mapToInt function you can archive this easily:

String number = "1 2 3 4 5";
List<Integer> x = Arrays.stream(number.split("\\s"))
        .map(Integer::parseInt)
        .collect(Collectors.toList());

or

String stringNum = "1 2 3 4 5 6 7 8 9 0";

List<Integer> poolList = Arrays.stream(stringNum.split("\\s"))
        .mapToInt(Integer::parseInt)
        .boxed()
        .collect(Collectors.toList());