Javafx - preenchendo um array de inteiro com textfield

Aqui está um bom exemplo de como usar o textfield
do javafx para preencher um array de tipo primtivo.
O código é indicado aos iniciantes de javafx.

 Veja abaixo imagens do programa em execução:

  Veja abaixo o código do programa:

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.scene.canvas.Canvas;

import javafx.scene.canvas.GraphicsContext;

import javafx.scene.control.Button;

import javafx.scene.control.TextField;

import javafx.stage.Stage;

import javafx.scene.paint.Color;

import javafx.scene.layout.HBox;

import javafx.scene.layout.Pane;

import javafx.scene.text.Font;

import javafx.scene.text.FontWeight;

import javafx.scene.text.Text;

import javafx.scene.input.KeyCode;

import javafx.event.EventHandler;

import javafx.geometry.Insets;

import javafx.scene.input.KeyEvent;

import java.util.function.UnaryOperator;

import javafx.scene.control.TextFormatter;

import javafx.scene.control.TextFormatter.Change;

public class PROJETO extends Application {

     static int k = 0, l = 0;

     public static int TAM = 10, inicio, fim;

     static Canvas canvas = new Canvas ( 620, 350 );

     static GraphicsContext ctx = canvas.getGraphicsContext2D ( );

     static Pane ro_ot = new Pane ( );

     static Scene sce_ne = new Scene ( ro_ot, 620, 350 );

     static Button btn_1 = new Button ( "TECLE ENTER" );

     static TextField textField_1 = new TextField ( );

     static TextField textField_2 = new TextField ( );

     static HBox hbox_1 = new HBox ( textField_1 );

     static HBox hbox_2 = new HBox ( textField_2 );

     static Text t_0 = new Text ( );

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

     public static void Informe ( ) {

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

         ctx.setFill ( Color.RED );

         ctx.fillText ( "Por: ", 200, 242 );

         ctx.setFill ( Color.BLUE );

         ctx.fillText ( "Samuel Lima", 240, 242 );

         ctx.setFill ( Color.BLACK );

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

         ctx.setFill ( Color.RED );

         ctx.fillText ( " MUITO OBRIGADO", 250, 320 );

     }

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

     public static void limitTextField ( TextField textField, int limit ) {

         UnaryOperator < Change > textLimitFilter = change -> {

              if ( change.isContentChange ( ) ) {

                   int newLength = change.getControlNewText ( ).length ( );

                   if ( newLength > limit ) {

                        String trimmedText = change.getControlNewText ( )

                                 .substring ( 0, limit );

                        change.setText ( trimmedText );

                        int oldLength = change.getControlText ( ).length ( );

                        change.setRange ( 0, oldLength );

                   }

              }

              return change;

         };

         textField.setTextFormatter ( new TextFormatter < Object > (

                   textLimitFilter ) );

     }

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

     public static int Array_2 ( int vet [ ] ) {

         //Esconde o textfield

         textField_1 .setVisible ( false );

         t_0.setVisible ( false );

         hbox_2.setPadding ( new Insets ( 60, 0, 10, 340 ) );

         // Abaixo ajustamos o total de colunas do TextField

         textField_2.setPrefColumnCount ( 2 );

         textField_2.setPromptText ( "fim" );

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

         ctx.setFill ( Color.BLUE );

         ctx.fillText ( "Insira o ", 190, 80 );

         ctx.setFill ( Color.RED );

         ctx.fillText (  " 1º", 240, 80 );

         ctx.setFill ( Color.BLUE );

         ctx.fillText ( "número", 270, 80 );

         textField_2.setOnKeyPressed ( new EventHandler < KeyEvent > ( ) {

              @Override

              public void handle ( KeyEvent event ) {

                   limitTextField ( textField_2, 2 );

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

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

                        ctx.setFill ( Color.BLUE );

                        // convertendo string para inteiro

                        fim = Integer.parseInt ( textField_2.getText ( ) );

                        if ( Integer.parseInt ( textField_2.getText ( ) ) >= 0

                                 && Integer.parseInt ( textField_2.getText ( ) ) < 100 ) {

                            Inf_quant ( vet );

                        }

                   }

              }

         } );

         ro_ot.getChildren ( ).addAll ( hbox_2 );

         return 0;

     }

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

     public static int Inf_quant ( int vet [ ] ) {

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

         int a = 0, i;

         StringBuilder st = new StringBuilder ( );

         k++;

         int [ ] Vetor = new int [ inicio + 2 ];     

         for ( i = 1; i < inicio + 1 ; i++ ) {

              Vetor [ i ] = ' ';        

         }

         ctx.clearRect ( 180, 70, 200, 20 );

         ctx.clearRect ( 240, 70, 20, 20 );

         ctx.clearRect ( 260, 70, 200, 20 );

         //limpa o campo do textfiel;

         textField_2.clear ( );

         ctx.setFill ( Color.BLUE );

         ctx.fillText ( "Insira o ", 190, 80 );

         ctx.setFill ( Color.RED );

         ctx.fillText ( " " + ( k + 1 ) + " º", 240, 80 );

         ctx.setFill ( Color.BLUE );

         ctx.fillText ( "número", 275, 80 );

         vet [ k ] = fim;

         st.append ( vet [ k ]  );   

         for ( i = 0; i < inicio + 1; i++ ) {

              Vetor [ a ] = vet [ i  ];

              a++;

         }

         if ( k == inicio ){

              st = new StringBuilder ( );

              //Esconde o textfield

              textField_2 .setVisible ( false );

              ctx.clearRect ( 180, 70, 400, 20 );

              for ( i = 1; i < inicio + 1; i++ ){

                   if ( Vetor [ i ] != ' ' )

                        if ( Vetor [ i ] % 10 == 0 )

                            st.append ("\n");

                   if ( Vetor [ i ] >= 0 && Vetor [ i ] <= 9 )

                        st.append ( "0" );

                   System.out.printf ( "%3d", Vetor [ i ] );

                   st.append ( Vetor [ i ] + "\t");

              }

              ctx.setFill ( Color.BLUE );

              ctx.fillText ( "Veja abaixo o array preenchido", 220, 80 );

              ctx.setFill ( Color.RED );

              ctx.fillText ( " " + st, 160, 110 );

              Informe ( );

         }

         return 0;

     }

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

     public static int Array_1 ( int vet [ ] ) {

         hbox_1.setPadding ( new Insets ( 60, 0, 10, 420 ) );

         // Abaixo ajustamos o total de colunas do TextField

         textField_1.setPrefColumnCount ( 2 );

         textField_1.setPromptText ( "ini" );

         ctx.setFont ( Font.font ( "Tahoma", FontWeight.NORMAL, 12 ) );

         ctx.setFill ( Color.BLACK );

         t_0.setFont( Font.font ( "Arial", FontWeight.NORMAL, 15 ) );

         t_0.setFill ( Color.BLACK );

         t_0.setX ( 180 );// coluna

         t_0.setY ( 80 );// linha

         t_0.setText ( "Quantos números deseja inserir ?" );  

         textField_1.setOnKeyPressed ( new EventHandler < KeyEvent > ( ) {

              @Override

              public void handle ( KeyEvent event ) {

                   limitTextField ( textField_1, 2 );

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

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

                        ctx.setFill ( Color.BLUE );

                        // convertendo string para inteiro

                        inicio = Integer.parseInt ( textField_1.getText ( ) );

                        if ( Integer.parseInt ( textField_1.getText ( ) ) >= 0

                                 && Integer.parseInt ( textField_1.getText ( ) ) < 100 ) {

                            Array_2 ( vet );

                        }

                   }

              }

         } );

         return 0;

     }

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

     public void start ( Stage stage ) {

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

         stage.setTitle ( "JAVAFX - PREENCHENDO UM ARRAY COM TEXTFIELD" );

         //Criando moldura e dando efeitos

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

                   + "-fx-border-width: 12;" + "-fx-border-insets: 5;"

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

         ctx.setFill ( Color.RED );

         ctx.fillText ( "PREENCHENDO UM ARRAY COM TEXTFIELD", 150, 50 );

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

         int [ ] vet = new int [ 100 ];

         Array_1 ( vet );

         ro_ot.getChildren ( ).addAll ( canvas, hbox_1, t_0 );

         stage.setScene ( sce_ne );

         stage.show ( );

     }

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

     public static void main ( String [ ] args ) {

         Application.launch ( args );

     }

}