Java Programming

First I imrpoved performance of split by replacing the String.split() call with a custom method using StringTokenizer:

                final StringTokenizer st = new StringTokenizer(string, separator, true);
                String token = null;
                String lastToken = separator; //if first token is separator
                while (st.hasMoreTokens()) {
                    token = st.nextToken();
                    if (token.equals(separator)) {
                        if (lastToken.equals(separator)) { //no value between 2 separators?
                            result.add(emptyStrings ? "" : null);
                        }
                    } else {
                        result.add(token);
                    }
                    lastToken = token;
                }//next token

But this is still not very fast (as it is one of the "hot spots" in my profiling sessions). I wonder if it can go still faster to split strings with ";" as the delimiter?