private static String removeWhiteSpace(String string) {
    StringBuilder result = null;
    for (int i = 0, length = string.length(); i < length; i++) {
      char c = string.charAt(i);
      if (c == ' ' || c == '\t' || c == '\f' || c == '\n' || c == '\r') { // jls-3.6
        if (result == null) {
          result = new StringBuilder(string.substring(0, i));
        }
      }
      else if (result != null) {
        result.append(c);
      }
    }
    return result == null ? string : result.toString();
  }
private static String removeWhiteSpace(String string)