Javafx - extraindo códigos ascii de string

Aqui está um bom exemplo de como
extrair códigos ASCII de uma string.
Confira no vídeo e na imagem
o funcionamento do programa.

 Veja abaixo uma imagem do programa em execução:

 
 Veja abaixo o vídeo do programa:

 Veja abaixo o código do programa:

import javafx.application.Application;

import javafx.scene.Node;

import javafx.scene.Scene;

import javafx.scene.canvas.Canvas;

import javafx.scene.canvas.GraphicsContext;

import javafx.scene.control.*;

import javafx.scene.layout.GridPane;

import javafx.scene.layout.Pane;

import javafx.scene.paint.Color;

import javafx.scene.text.Font;

import javafx.scene.text.FontWeight;

import javafx.stage.Stage;

import javafx.beans.value.ChangeListener;

import javafx.beans.value.ObservableValue;

import javafx.collections.FXCollections;

import javafx.geometry.Insets;

import javafx.scene.control.Button;

import javafx.scene.input.KeyCode;

public class PROJETO extends Application {

     static String str = "";

     static String str1 = "";

     static String [ ] st = { "Um", "Dois", "Tres", "Quatro", "Cinco", "Seis",

         "Sete", "Oito", "Nove", "Dez", "Onze", "Doze", "Viva_Java" };

     static int i, x = 0;

     static Canvas canvas = new Canvas ( 600, 340 );

     static GraphicsContext ctx = canvas.getGraphicsContext2D ( );

     static Pane root = new Pane ( );

     static Scene scene = new Scene ( root, 600, 340 );

     static GridPane grid = new GridPane ( );

     static Button btn_1 = new Button ( "FECHAR" );

     // /////////////////////////////////////////////////////////////////////////

     public static void Informe ( ) {

         ctx.setFont ( Font.font ( "Arial", FontWeight.NORMAL, 13 ) );

         ctx.setFill ( Color.RED );

         ctx.fillText ( "Por: ", 200, 240 );

         ctx.setFill ( Color.BLUE );

         ctx.fillText ( "Samuel Lima", 240, 240 );

         ctx.setFill ( Color.BLACK );

         ctx.fillText ( "sa_sp10@hotmail.com", 200, 260 );

         ctx.setFill ( Color.RED );

         ctx.fillText ( " MUITO OBRIGADO", 250, 290 );

     }

     // /////////////////////////////////////////////////////////////////////////

     public static Node Sair ( ) {

         btn_1.setPrefWidth ( 100 );// Largura do botão

         btn_1.setLayoutX ( 267 );// Posição do botão coluna

         btn_1.setPrefHeight ( 20 );// altura do botão

         btn_1.setLayoutY ( 300 );// //Posição do botão linha

         btn_1.setStyle ( "-fx-padding: 1;" + "-fx-border-style: solid inside;"

                   + "-fx-border-width: 2;" + "-fx-border-insets: 1;"

                   + "-fx-border-radius: 1;" + "-fx-border-color: red;"

                   + "-fx-font-style: italic;" + "-fx-font-family: Consolas;" );

         btn_1.setOnKeyPressed ( e -> {

              if ( e.getCode ( ) == KeyCode.ENTER ) {

                   System.exit ( 0 );

              }

         } );

         return btn_1;

     }

     // /////////////////////////////////////////////////////////////////////////

     public static void Choice_box ( ) {

         ChoiceBox < String > cb = new ChoiceBox < String > (

                   FXCollections.observableArrayList ( st ) );

         cb.setStyle ( "-fx-padding: 5;" + "-fx-border-style: solid inside;"

                   + "-fx-border-width: 2;" + "-fx-border-insets: 5;"

                   + "-fx-border-radius: 5;" + "-fx-border-color: black;" );

         cb.getSelectionModel ( ).selectedIndexProperty ( )

         .addListener ( new ChangeListener < Number > ( ) {

              public void changed ( ObservableValue ov, Number value,

                        Number new_value ) {

                   str = st [ new_value.intValue ( ) ];

                   str1 = "";

                   // Coluna, linha, comprimento, altura

                   ctx.clearRect ( 170, 100, 400, 50 );

                   ctx.clearRect ( 170, 130, 500, 50 );

                   ctx.clearRect ( 170, 160, 500, 50 );

                   ctx.setFont ( Font.font ( "Arial", FontWeight.NORMAL,15 ) );                              

                   i = new_value.intValue ( );

                   ctx.setFill ( Color.BLACK );

                   ctx.fillText ( "Palavra => ", 190, 110 );

                   ctx.setFill ( Color.RED );

                   ctx.fillText ( " " + str, 270, 110 );

                   ctx.setFill ( Color.BLACK );

                   ctx.fillText ( "Abaixo os códigos ASCII extraído", 190, 140 );

                   ctx.setFill ( Color.RED );

                   for ( i = 0; i < str.length ( ); ++i ) {

                        char c = str.charAt ( i );

                        System.out.println ( ( int ) c );

                        str1 += ( int ) c + " ";

                   }            

                   ctx.setFill ( Color.RED );

                   ctx.fillText ( str1, 190, 170 );             

              }

         } );

         grid.add ( cb, 1, 1 );

     }

     // /////////////////////////////////////////////////////////////////////////

     public void start ( Stage stage ) {

         stage.setTitle ( "JAVAFX - EXTRAINDO CÓDIGOS ASCII DE STRING" );

         // Criando moldura e dando efeitos

         root.setStyle ( "-fx-padding: 5;" + "-fx-border-style: solid inside;"

                   + "-fx-border-width: 10;" + "-fx-border-insets: 5;"

                   + "-fx-border-radius: 5;" + "-fx-border-color: darkblue;" );

         ctx.setFont ( Font.font ( "Arial", FontWeight.NORMAL, 15 ) );

         ctx.setFill ( Color.RED );

         ctx.fillText ( "JAVAFX - EXTRAINDO CÓDIGOS ASCII DE STRING", 160, 50 );

         ctx.setFill ( Color.BLUE );

         ctx.fillText ( "Escolha uma palavra no choicebox", 190, 80 );

         Choice_box ( );

         Sair ( );

         Informe ( );

         grid.setPadding ( new Insets ( 15, 15, 60, 15 ) );

         root.getChildren ( ).addAll ( canvas, btn_1 );

         root.getChildren ( ).addAll ( grid );

         stage.setScene ( scene );

         stage.show ( );

     }

     // /////////////////////////////////////////////////////////////////////////

     public static void main ( String [ ] args ) {

         launch ( args );

     }

}