Scanner vs. StringTokenizer vs. String.Split

Question

I just learned about Java\'s Scanner class and now I\'m wondering how it compares/competes with the StringTokenizer and String.Split. I know that the StringTokenizer and Str

Answer 1

For the default scenarios I would suggest Pattern.split() as well but if you need maximum performance (especially on Android all solutions I tested are quite slow) and you only need to split by a single char, I now use my own method:

public static ArrayList splitBySingleChar(final char[] s,
        final char splitChar) {
    final ArrayList result = new ArrayList();
    final int length = s.length;
    int offset = 0;
    int count = 0;
    for (int i = 0; i < length; i++) {
        if (s[i] == splitChar) {
            if (count > 0) {
                result.add(new String(s, offset, count));
            }
            offset = i + 1;
            count = 0;
        } else {
            count++;
        }
    }
    if (count > 0) {
        result.add(new String(s, offset, count));
    }
    return result;
}

Use "abc".toCharArray() to get the char array for a String. For example:

String s = "     a bb   ccc  ffffdd eeeee  ffffff    ggggggg ";
ArrayList result = splitBySingleChar(s.toCharArray(), ' ');