String Token Grabber

public class TokenGrabber {
    public static String grabToken(String str, int index, char delim) {
        if (index > -1) { // Within minimum bounds.
            int pos = -1, step = 0;
            if (index > 0) {
                for (; step <= index; step++) {
                    pos = str.indexOf(delim, pos + (step > 1 ? 1 : 0));
                }
            }
            if (pos < 0 && step > 0) return null; // Out of maximum bounds.
            int end = str.indexOf(delim, pos + 1);
            if (end == -1) end = str.length();
            return str.substring(pos + 1, end);
        }
        return null;
    }

    public static String grabToken(String str, int index) {
        return grabToken(str, index, '|');
    }

    public static void main(String[] args) {
        String str = "foo|bar|baz|fizz|buzz";

        System.out.println(grabToken(str, -1)); // null
        System.out.println(grabToken(str, 0));  // foo
        System.out.println(grabToken(str, 1));  // bar
        System.out.println(grabToken(str, 2));  // baz
        System.out.println(grabToken(str, 3));  // fizz
        System.out.println(grabToken(str, 4));  // buzz
        System.out.println(grabToken(str, 5));  // null
    }
}