code: public static List<String> tokenize(CharSequence self, Character token) {
          return tokenize(self, token.toString());
      }
docs: Tokenize a CharSequence based on the given character delimiter.
  For example:
  <pre class="groovyTestCase">
  char pathSep = ':'
  assert "/tmp:/usr".tokenize(pathSep) == ["/tmp", "/usr"]
  </pre>
  
  @param self  a CharSequence
  @param token the delimiter
  @return a List of tokens
  @see java.util.StringTokenizer#StringTokenizer(String, String)
  @since 1.8.2