Splitting and converting String to int

Question

I have a problem with my code. I read a couple of numbers of a text-file. For example: Textfile.txt

1, 21, 333

With my following code I wan

Answer 1

Here's a solution using Java 8 streams:

String line = "1,21,33";
List ints = Arrays.stream(line.split(","))
        .map(Integer::parseInt)
        .collect(Collectors.toList());

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Alternatively, with a loop, just use parseInt:

String line = "1,21,33";
for (String s : line.split(",")) {
    System.out.println(Integer.parseInt(s));
}

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If you really want to reinvent the wheel, you can do that, too:

String line = "1,21,33";
for (String s : line.split(",")) {
    char[] chars = s.toCharArray();
    int sum = 0;
    for (int i = 0; i < chars.length; i++) {
        sum += (chars[chars.length - i - 1] - '0') * Math.pow(10, i);
    }
    System.out.println(sum);
}