code: public static void putLongList(Writer writer, List<Long> values) throws IOException {
  		if (values == null) {
  			writer.write("null");
  		} else {
  			startArray(writer);
  			for (int i = 0; i < values.size(); i++) {
  				put(writer, values.get(i));
  				if (i != values.size() - 1) {
  					addSeparator(writer);
  				}
  			}
  			endArray(writer);
  		}
  	}
docs: Writes the given value with the given writer.
  @param writer
  @param values
  @throws IOException
  @author vvakame