Using the grammar as follows: gui ::= Window STRING ‘(‘ NUMBER ‘,’ NUMBER ‘)’ layout widgets End ‘.’ layout ::= Layout layout_type ‘:’ layout_type ::= Flow | Grid ‘(‘ NUMBER ‘,’ NUMBER [’,’ NUMBER ‘,’ NUMBER] ‘)’ widgets ::= widget widgets | widget widget ::= Button STRING ‘;’ | Group radio_buttons End ‘;’ | Label STRING ‘;’ | Panel layout widgets End ‘;’ | Textfield NUMBER ‘;’ radio_buttons ::= radio_button radio_buttons | radio_button radio_button ::= Radio STRING ‘;’
Automatically creates a GUI in JavaFX.
Examples:
Window “Calculator” (200, 200) Layout Flow: 
Textfield 20;
   Panel Layout Grid(4, 3, 5, 5):
     Button “7”;
     Button “8”;
     Button “9”;
     Button “4”;
     Button “5”;
     Button “6”;
     Button “1”;
     Button “2”;
     Button “3”;
     Label “”;
     Button “0”;
   End;
End.