Question

I want to write a function like that:

- Input: "1" -> return : "1"
- Input: "12" -> return : ["1","2"]

If I use the function split(): String.valueOf("12").split("") -> ["","1","2"]
But, I only want to get the result: ["1","2"].

What the best way to do this?

Infact, I can do that:

private List<String> decomposeQuantity(final int quantity) {
    LinkedList<String> list = new LinkedList<String>();
    int parsedQuantity = quantity;
    while (parsedQuantity > 0) {
        list.push(String.valueOf(parsedQuantity % 10));
        parsedQuantity = parsedQuantity / 10;
    }
    return list;
}

But, I want to use split() for having an affective code

Answer 1

String input = "123";
String regex = "\\d";
Matcher m = Pattern.compile(regex).matcher(input);

String[] output = new String[input.length()];
int index = 0;

while (m.find())
    output[index++] = m.group();

for (String s : output)
    System.out.println(s);