Question

for example….

26, 15, 37

how could i get the numbers from a Scanner , ( lets say for instance i want to add or subtract,,,?)

Answer 1

Take a look at String.split().

If you want to use the Scanner API:

private static final Pattern COMMA_PATTERN = Pattern.compile("\\s*,\\s*");

public List<Integer> getIntegerList() {
    // Assumes scanner is positioned at first integer in list.
    List<Integer> integers = new ArrayList<Integer>();
    for (;;) {
        integers.add(scanner.nextInt());
        if (scanner.hasNext(COMMA_PATTERN)) {
            // Read and discard comma token, and continue parsing list.
            scanner.next();
        } else {
            // Number is not followed by comma, stop parsing.
            break;
        }
    }
    return integers;
}

More error handling is needed, but hopefully, this example illustrates the approach.

You can also use Scanner.useDelimiter():

private static final Pattern COMMA_PATTERN = Pattern.compile("\\s*,\\s*");

public List<Integer> getIntegerList() {
    // Assumes scanner is positioned at first integer in list.
    List<Integer> integers = new ArrayList<Integer>();
    Pattern oldDelimiter = scanner.delimiter();
    scanner.useDelimiter(COMMA_PATTERN);
    while (scanner.hasNextInt()) {
        integers.add(scanner.nextInt());
    }
    // Reset delimiter
    scanner.useDelimiter(oldDelimiter);
    return integers;
}