code: protected void assertArgumentsCount( String... args )
      {
          if (args.length != getArity())
              throw new IllegalArgumentException(
                  String.format( "Wrong number of arguments: expected %d but got %d", getArity(), args.length ) );
      }
docs: <p>assertArgumentsCount.</p>
  
  @param args a {@link java.lang.String} object.