private static int hashWrapperName(String xn){
  if (xn.length() < 3) {
    return 0;
  }
  return (3 * xn.charAt(1) + xn.charAt(2)) % 16;
}

private static int hashWrapperName ( String xn ) { if ( xn . length ( ) < 3 ) { return 0 ; } return ( 3 * xn . charAt ( 1 ) + xn . charAt ( 2 ) ) % 16 ; }
class name to wrapper hash , derived from wrapper . hashwrap ( )
