DigitIntStream.java

package com.github.fge;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.IntStream;

public final class DigitIntStream
{
    // Note: no checking that "number" is >= 0 or base > 0
    private static List<Integer> digitsAsList(int number, final int base)
    {
        final List<Integer> ret = new ArrayList<>();
        do {
            ret.add(number % base);
            number /= base;
        } while (number > 0);

        return ret;
    }

    private static IntStream digitsOf(final int number, final int base,
        final boolean reversed)
    {
        final List<Integer> list = digitsAsList(number, base);
        if (!reversed)
            Collections.reverse(list);
        return list.stream().mapToInt(Number::intValue);
    }

    public static void main(final String... args)
    {
        digitsOf(12345, 10, false).forEach(System.out::println);
    }
}