Javafx - pares - ímpares - primos e não primos

Aqui está um exemplo de como utilizar
vários TextArea do javafx dentro de uma janela.

Veja abaixo uma imagem do programa em execução:

Veja abaixo o código do programa: 

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import javafx.application.Application;

import javafx.geometry.Insets;

import javafx.scene.Scene;

import javafx.scene.control.Label;

import javafx.scene.control.TextArea;

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.scene.text.Text;

import javafx.stage.Stage;

public class PROJETO extends Application {

     static int prim = -1;

     static Pane root = new Pane ( );

     Scene scene = new Scene ( root, 570, 510, Color.WHITE );     

     static GridPane grid_1 = new GridPane ( );

     static GridPane grid_2 = new GridPane ( );

     static GridPane grid_3 = new GridPane ( );

     static GridPane grid_4 = new GridPane ( );   

     static GridPane grid_5 = new GridPane ( );

     static TextArea text_1 = new TextArea ( );

     static TextArea text_2 = new TextArea ( );

     static TextArea text_3 = new TextArea ( );

     static TextArea text_4 = new TextArea ( );   

     static Text t_1 = new Text ( );

     static Text t_2 = new Text ( );

     static Text t_3 = new Text ( );

     static Text t_4 = new Text ( );

     static Text t_5 = new Text ( );

     static List < Integer > arr = new ArrayList <> ( Arrays.asList ( ) );

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

     public static int Text_Area_4 ( ) {

         t_5.setFont ( Font.font ( "Tahoma", FontWeight.NORMAL, 12 ) );

         t_5.setX ( 380 );

         t_5.setY ( 270 );

         t_5.setFill ( Color.BLACK );

         t_5.setText ( "Não primos" );

         grid_4.setPadding ( new Insets ( 5 ) );

         //Posiciona o TextArea na horizontal

         grid_4.setHgap ( 10 );

         //Posiciona o TextArea na vertical

         grid_4.setVgap ( 10 );     

         int i, j = 0;

         StringBuilder str1 = new StringBuilder ( );

         prim = 2;

         for ( i = 0; i <= 100; i++ ) {

              int ePrimo = 1;

              for ( j = 2; j <= i / 2; j++ ) {

                   if ( i % j == 0 ) {

                        ePrimo = 0;

                        break;

                   }

              }

              if ( prim > 0 && i > 1 ) {

                   if ( ePrimo == 0 ) {

                        str1.append ( i );

                        str1.append ( "\t  " );

                   }

              }

         }

         //Permite que o texto continue abaixo

         //iniciando um scroll quando

         //atinge o tamanho do TextArea

         text_4.setWrapText ( true );

         //Largura máximo do TextArea

         text_4.setPrefWidth ( 200 );

         //Altura máxima do TextArea

         text_4.setPrefHeight ( 150 );

         //Adiciona o TextArea na vertical e horizontal

         grid_4.add ( text_4, 30, 28 );

         //Inicia um texto opcionalmente no TextArea

         //No nosso caso estamos iniciando str1

         text_4.setText ( " " + str1 );   

         text_4.setStyle ( "-fx-padding: 5;" + "-fx-border-style: solid inside;"

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

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

         root.getChildren ( ).add ( grid_4 );

         return 0;

     }

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

     public static int Text_Area_3 ( ) {

         t_4.setFont ( Font.font ( "Tahoma", FontWeight.NORMAL, 12 ) );

         t_4.setX ( 130 );

         t_4.setY ( 270 );

         t_4.setFill ( Color.BLACK );

         t_4.setText ( "Primos" );

         grid_3.setPadding ( new Insets ( 5 ) );

         //Posiciona o TextArea na janela na horizontal

         grid_3.setHgap ( 10 );

         //Posiciona o TextArea na janela na vertical

         grid_3.setVgap ( 10 );     

         int i, j = 0;

         StringBuilder str1 = new StringBuilder ( );

         prim = 2;

         for ( i = 0; i <= 100; i++ ) {

              int ePrimo = 1;

              for ( j = 2; j <= i / 2; j++ ) {

                   if ( i % j == 0 ) {

                        ePrimo = 0;

                        break;

                   }

              }

              if ( prim > 0 && i > 1 ) {

                   if ( ePrimo == 1 ) {

                        str1.append ( i );

                        str1.append ( "\t  " );

                   }

              }

         }

         //Permite que o texto continue abaixo

         //iniciando um scroll quando

         //atinge o tamanho do TextArea

         text_3.setWrapText ( true );

         //Largura máximo do TextArea

         text_3.setPrefWidth ( 200 );

         //Altura máxima do TextArea

         text_3.setPrefHeight ( 150 );

         //Adiciona o TextArea na vertical e horizontal

         grid_3.add ( text_3, 5, 28 );

         //Inicia um texto opcionalmente no TextArea

         //No nosso caso estamos iniciando str1

         text_3.setText ( " " + str1 );   

         text_3.setStyle ( "-fx-padding: 5;" + "-fx-border-style: solid inside;"

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

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

         root.getChildren ( ).add ( grid_3 );

         return 0;

     }

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

     public static int Text_Area_2 ( ) {

         t_3.setFont ( Font.font ( "Tahoma", FontWeight.NORMAL, 12 ) );

         t_3.setX ( 130 );

         t_3.setY ( 80 );

         t_3.setFill ( Color.BLACK );

         t_3.setText ( "Pares" );

         grid_2.setPadding ( new Insets ( 5 ) );

         //Posiciona o TextArea na janela na horizontal

         grid_2.setHgap ( 10 );

         //Posiciona o TextArea na janela na vertical

         grid_2.setVgap ( 10 );     

         String str = "";

         int i;

         //Preenchendo o ArrayList com laço for

         for ( i = 1; i <= 100; i++ ) {

              arr.add ( i );

         }

         for ( i = 0; i < arr.size ( ); i++ ) {

              if ( arr.get ( i ) % 2 == 0 ) {

                   str += arr.get ( i ) + "\t ";

              }

         }

         //Permite que o texto continue abaixo

         //iniciando um scroll quando

         //atinge o tamanho do TextArea

         text_2.setWrapText ( true );

         //Largura máximo do TextArea

         text_2.setPrefWidth ( 200 );

         //Altura máxima do TextArea

         text_2.setPrefHeight ( 150 );

         grid_2.add ( text_2, 5, 9 );

         //Inicia um texto opcionalmente no TextArea

         String text = str;

         text_2.setText ( text );   

         text_2.setStyle ( "-fx-padding: 5;" + "-fx-border-style: solid inside;"

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

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

         root.getChildren ( ).add ( grid_2 );

         return 0;

     }

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

     public static int Text_Area_1 ( ) {

         t_2.setFont ( Font.font ( "Tahoma", FontWeight.NORMAL, 12 ) );

         t_2.setX ( 380 );

         t_2.setY ( 80 );

         t_2.setFill ( Color.BLACK );

         t_2.setText ( "Ímpares" );

         grid_1.setPadding ( new Insets ( 5 ) );

         //Posiciona o TextArea na janela na horizontal

         grid_1.setHgap ( 10 );

         //Posiciona o TextArea na janela na vertical

         grid_1.setVgap ( 10 );     

         String str = "";

         int i;

         //Preenchendo o ArrayList com laço for

         for ( i = 1; i <= 100; i++ ) {

              arr.add ( i );

         }

         for ( i = 0; i < arr.size ( ); i++ ) {

              if ( arr.get ( i ) % 2 == 1 ) {

                   str += arr.get ( i ) + "\t ";

              }

         }

         //Permite que o texto continue abaixo

         //iniciando um scroll quando

         //atinge o tamanho do TextArea

         text_1.setWrapText ( true );

         //Largura máximo do TextArea

         text_1.setPrefWidth ( 200 );

         //Altura máxima do TextArea

         text_1.setPrefHeight ( 150 );

         //Adiciona o TextArea na vertical e horizontal

         grid_1.add ( text_1, 30, 9 );

         //Inicia um texto opcionalmente no TextArea

         String text = str;

         text_1.setText ( text );   

         text_1.setStyle ( "-fx-padding: 5;" + "-fx-border-style: solid inside;"

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

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

         root.getChildren ( ).add ( grid_1 );

         return 0;

     }

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

     @Override

     public void start ( Stage stage ) {

         String str_2 = "";

        String [ ] inf = {

                "Por: Samuel Lima",

                "sa_sp10@hotmail.com" };

         int i;

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

              str_2 += ( "\n");

              str_2 += ( "\t");

              str_2 += ( " ");

              str_2 += ( inf [ i ] );

         }

         grid_5.setVgap ( 43 );

         grid_5.setHgap ( 20 );

         grid_5.add ( new Label ( str_2 ), 10, 10 );

         root.getChildren ( ).addAll ( grid_5 );

         stage.setTitle ( "JAVAFX - PARES - ÍMPARES - PRIMOS E NÃO PRIMOS" );

         // Criando moldura

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

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

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

         t_1.setFont ( Font.font ( null, FontWeight.NORMAL, 15 ) );

         t_1.setX ( 110 );

         t_1.setY ( 50 );

         t_1.setFill ( Color.RED );

         t_1.setText ( "JAVAFX - PARES - ÍMPARES - PRIMOS E NÃO PRIMOS" );

        // Não mudar estas ordens

         Text_Area_4 ( );  

         Text_Area_1 ( );

         Text_Area_3 ( );

         Text_Area_2 ( );      

         root.getChildren ( ).addAll ( t_1, t_2, t_3, t_4, t_5 );

         stage.setScene ( scene );

         stage.show ( );

     }

     public static void main ( String [ ] args ) {

         Application.launch ( args );

     }   

}