Java char array to int

Question

Is it possible to convert a char[] array containing numbers into an int?

Answer 1

Does the char[] contain the unicode characters making up the digits of the number? In that case simply create a String from the char[] and use Integer.parseInt:

char[] digits = { '1', '2', '3' };
int number = Integer.parseInt(new String(digits));

Answer 2

Even more performance and cleaner code (and no need to allocate a new String object):

int charArrayToInt(char []data,int start,int end) throws NumberFormatException
{
    int result = 0;
    for (int i = start; i < end; i++)
    {
        int digit = (int)data[i] - (int)'0';
        if ((digit < 0) || (digit > 9)) throw new NumberFormatException();
        result *= 10;
        result += digit;
    }
    return result;
}