code: private void format(final StringBuilder sb) {
  		CodedMessageDefinition def = CodedMessageDefinition.getDefinition(code);
  		if (def == null) {
  			sb.append(MessageFormats.formatFallback(code, arguments.toArray()));
  		} else {
  			sb.append(MessageFormats.format(def.getTemplate(), def.getLocale(), arguments.toArray()));
  		}
  		for (String unformattedArgument : unformattedArguments) {
  			sb.append('，');
  			sb.append(unformattedArgument);
  		}
  	}
docs: 将消息格式化为字符串。