public String code() {
        if (codes == null)
            return null;
        if (codes[shift] == null)
            throw new NumberFormatException("missing code for shift: " + shift);
        return codes[shift];
    }
public String code ( ) { if ( codes == null ) return null ; if ( codes [ shift ] == null ) throw new NumberFormatException ( "missing code for shift: " + shift ) ; return codes [ shift ] ; }
Get currency code that will be used for current shift.