code: public static <E> ClassicCounter<E> loadCounter(String filename, Class<E> c) throws RuntimeException {
      ClassicCounter<E> counter = new ClassicCounter<E>();
      loadIntoCounter(filename, c, counter);
      return counter;
    }
docs: Loads a Counter from a text file. File must have the format of one
  key/count pair per line, separated by whitespace.
  
  @param filename
  the path to the file to load the Counter from
  @param c
  the Class to instantiate each member of the set. Must have a
  String constructor.
  @return The counter loaded from the file.