Javafx - marcando ocorrências aleatórias

Neste exemplo estamos preenchendo
um Array bidimensional do tipo primitivo
int com valores aleatórios na faixa de 1 a 100.
Feito isto introduzimos um número na entrada
de um textfield, que passa se o número existe
no array, e se existe o programa marca todas
as ocorrências daquele número no próprio array
em cor diferente dos demais elementos.

 Veja abaixo uma imagem do programa em execução:

 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.Button;

import javafx.stage.Stage;

import javafx.scene.paint.Color;

import javafx.scene.input.KeyCode;

import javafx.scene.layout.Pane;

import javafx.scene.text.Font;

import javafx.scene.text.FontWeight;

import javafx.event.EventHandler;

import javafx.scene.control.TextField;

import javafx.geometry.Insets;

import javafx.scene.layout.HBox;

import javafx.scene.input.KeyEvent;

import java.awt.Toolkit;

import java.util.function.UnaryOperator;

import javafx.scene.control.TextFormatter;

import javafx.scene.control.TextFormatter.Change;

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

public class PROJETO extends Application {

     public static int TAM = 10, pesq;

     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 ( "FECHAR" );

     static TextField textField_1 = new TextField ( );

     static HBox hbox_1 = new HBox ( textField_1 );

     static Boolean x = false;

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

     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 Pesquisa ( int Vet [ ] [ ] ) {

         hbox_1.setPadding ( new Insets ( 290, 0, 10, 170 ) );

         // Abaixo ajustamos o total de colunas do TextField

         textField_1.setPrefColumnCount ( 2 );

         textField_1.setPromptText ( "pesq" );

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

         ctx.setFill ( Color.BLACK );

         ctx.fillText ( "Pesquisa", 170, 280 );

         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

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

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

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

                            Arr ( Vet );

                        }

                   }

              }

         } );

         ro_ot.getChildren ( ).add ( hbox_1 );

         return 0;

     }

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

     public static Node But_ton_3 ( ) {

         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: blue;"

                   + "-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 Arr ( int Vet [ ] [ ] ) {

         int i, j = 0;

         StringBuilder str = new StringBuilder ( );

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

         ctx.setFill ( Color.BLUE );

         ctx.fillText ( "Imprimindo abaixo o array de inteiros", 190, 80 );

         ctx.setFont ( Font.font ( "Arial", FontWeight.BOLD, 14 ) );

         for ( i = 0; i < TAM; i++ ) {

              str.append ( "\n" );

              for ( j = 0; j < TAM; j++ ) {            

                   str.append ( "\t" );

                   if ( Vet [ i ] [ j ] == pesq ) {

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

                            str.append ( "0" );

                    Toolkit.getDefaultToolkit ( ).beep ( );

                        str.append ( Vet [ i ] [ j ] );

                   }

              }

         }

         if ( x == true ) {

              ctx.setFill ( Color.BLACK );

              ctx.fillText ( " " + str, 138, 100 );

         }

     }

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

     public void start ( Stage stage ) {

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

         stage.setTitle ( "JAVAFX - MARCANDO OCORRÊNCIAS ALEATÓRIAS" );

         // Criando moldura e dando efeitos

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

                   + "-fx-border-width: 18;" + "-fx-border-insets: 5;"

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

         ctx.setFill ( Color.RED );

         ctx.fillText ( "JAVAFX - MARCANDO OCORRÊNCIAS ALEATÓRIAS", 130, 50 );

         int [ ] [ ] Vet = new int [ TAM  ] [ TAM ];  

         int i, j = 0;

         StringBuilder str1 = new StringBuilder ( );

         ctx.setFont ( Font.font ( "Arial", FontWeight.NORMAL, 14 ) );

         for ( i = 0; i < TAM; i++ ) {

              str1.append ( "\n" );

              for ( j = 0; j < TAM; j++ ) {

                   Vet [ i ] [ j ] = ( int ) ( Math.random ( ) * 100 );

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

                        str1.append ( "0" );

                   str1.append ( Vet [ i ] [ j ] + "\t" );

              }

         }

         if ( x == false ) {

              ctx.setFill ( Color.MAGENTA );

              ctx.fillText ( " " + str1, 170, 100 );

              x = true;

              pesq = 0;

         }

         Arr ( Vet );

         Pesquisa ( Vet );

         But_ton_3 ( );

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

         stage.setScene ( sce_ne );

         stage.show ( );

     }

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

     public static void main ( String [ ] args ) {

         Application.launch ( args );

     }

}