ArrayList<Object> doesn't appear in textField

[Arek Wróbel]

So this is code for button to append arraylist in textField.

    private void printGamesListActionPerformed(java.awt.event.ActionEvent evt) {                                               
      Runner r = new Runner();
        gamesField.append(r.gamesList.toString());   //this should print list in text field, but it doesn't.
        Thread t1=  new Thread(new Runner());
        t1.start();  //This just print game list in console not in text field.
        
    }   

And there are all classes:
Runner.class where ArrayList is defined.

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package GamesSorter;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;

/**
 *
 * @author Cpu
 */
public class Runner implements Runnable{
    ArrayList<Game> gamesList = new ArrayList<>();
    File file;
    
    
    public void start()
    {
            downloadGamesList();
            sortList();
    }

    private void downloadGamesList()  {
        try {
         file = new File("Gry.txt");
        BufferedReader br = new BufferedReader(new FileReader(file));
        String wiersz = null;
        while ((wiersz = br.readLine()) != null)
        {
            addGames(wiersz);
        }
        } catch (FileNotFoundException ex) {
           ex.printStackTrace();
        } catch (IOException ex) {
           ex.printStackTrace();
        }

    }

    public void addGames(String wierszDoAnalizy) 
    {
        String [] elements = wierszDoAnalizy.split("/");
        Game newGame = new Game(elements[0] , elements[1] );
        gamesList.add(newGame);
    }

    public void sortList() {
        System.out.println("Tytuł gry:  ocena");
        Collections.sort(gamesList);
        System.out.println(gamesList );
    }
    
   public void deleteFile()
   {
       file.delete();
   }

    @Override
    public void run() {
 new Runner().start();
    }
    
}

Rame.class where frame is created with buttons and other things:

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package GamesSorter;

import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Cpu
 */
public class Rame extends javax.swing.JFrame {
    BufferedWriter bufferedWriter;
    /**
     * Creates new form Rame
     */
    public Rame() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        printGamesList = new javax.swing.JButton();
        gameTitleField = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        gameMarkField = new javax.swing.JTextField();
        addGameToList = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        gamesField = new javax.swing.JTextArea();
        listCleanerButton = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        printGamesList.setText("Wyświetl listę gier");
        printGamesList.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                printGamesListActionPerformed(evt);
            }
        });

        gameTitleField.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                gameTitleFieldActionPerformed(evt);
            }
        });

        jLabel1.setText("Nazwa Gry");

        jLabel2.setText("Ocena Gry");

        addGameToList.setText("Dodaj do listy gier");
        addGameToList.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addGameToListActionPerformed(evt);
            }
        });

        gamesField.setColumns(20);
        gamesField.setRows(5);
        jScrollPane1.setViewportView(gamesField);

        listCleanerButton.setText("Wyczyść listę gier");
        listCleanerButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                listCleanerButtonActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane1)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                                    .addComponent(gameMarkField)
                                    .addComponent(jLabel1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 63, Short.MAX_VALUE)
                                    .addComponent(gameTitleField, javax.swing.GroupLayout.Alignment.LEADING))
                                .addGap(18, 18, 18)
                                .addComponent(addGameToList, javax.swing.GroupLayout.DEFAULT_SIZE, 170, Short.MAX_VALUE))
                            .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 53, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(10, 10, 10)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(printGamesList, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(listCleanerButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addContainerGap()
                                .addComponent(printGamesList))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel1)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addComponent(gameTitleField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel2)
                            .addComponent(listCleanerButton))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(gameMarkField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(addGameToList, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addGap(18, 18, 18)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 182, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    private void printGamesListActionPerformed(java.awt.event.ActionEvent evt) {                                               
      Runner r = new Runner();
        gamesField.append(r.gamesList.toString());   //this should print list in text field, but it doesn't.
        Thread t1=  new Thread(new Runner());
        t1.start();  //This just print game list in console not in text field.
        
    }                                              

    private void gameTitleFieldActionPerformed(java.awt.event.ActionEvent evt) {                                               
        // TODO add your handling code here:
    }                                              

    private void addGameToListActionPerformed(java.awt.event.ActionEvent evt) {                                              
        String gameTitle;
        String mark;    
        try {
            bufferedWriter = new BufferedWriter(new FileWriter("Gry.txt", true));
           gameTitle = gameTitleField.getText();
           mark = gameMarkField.getText();
            bufferedWriter.write(gameTitle + "/" + mark);
            bufferedWriter.newLine();
            bufferedWriter.close();
        } catch (IOException ex) {
            Logger.getLogger(Rame.class.getName()).log(Level.SEVERE, null, ex);         
        }
    }                                             

    private void listCleanerButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                  
        System.out.println("Test");
        Runner runner = new Runner();
        try {
            FileWriter cleaner = new FileWriter("Gry.txt", false);
            cleaner.close();
        } catch (IOException ex) {
            Logger.getLogger(Rame.class.getName()).log(Level.SEVERE, null, ex);
        }

    }                                                 

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Rame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Rame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Rame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Rame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Rame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton addGameToList;
    private javax.swing.JTextField gameMarkField;
    private javax.swing.JTextField gameTitleField;
    public javax.swing.JTextArea gamesField;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JButton listCleanerButton;
    private javax.swing.JButton printGamesList;
    // End of variables declaration                   
}

and game.class (Propably you are not interested with this one.)

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package GamesSorter;

/**
 *
 * @author Cpu
 */
public class Game implements Comparable<Game>{
    String gameTitle;
    String mark;
    
    public boolean equals ( Object game)
    {
        Game g = (Game) game;
        return getGameTitle().equals(g.getGameTitle());
    }
    
    public int hashCode()
    {
        return gameTitle.hashCode();
    }
    
    //Konstruktor
    
    public Game(String gameTitle, String mark )
    {
        this.gameTitle = gameTitle;
        this.mark = mark;
    }

    //Gettery
    
    public String getGameTitle() {
        return gameTitle;
    }

    public String getMark() {
        return mark;
    }
    
    public String toString()
    {
        return gameTitle  + ": " + mark ;
    }

    @Override
    public int compareTo(Game o) {
       return gameTitle.compareTo(o.getGameTitle());
    }
    
}

[Arek Wróbel]

I checked textField value after appending but its null.

[Arek Wróbel]

Hmm arraylist is null when i checked while clicking button, dont know why.

[Arek Wróbel]

So arraylist is null at rame.class works fine at runner.class.

[Dave Tolls]

Runner r = new Runner();
gamesField.append(r.gamesList.toString());

In this code you are creating a new Runner, which will have an empty List (line 21 of your Runner code above).

I'm not too sure what it is you are trying to do, so can't offer a suggestion at the moment.

[Arek Wróbel]

By making new Runner i tried to import arraylist from this class. I dont know if it is good idea.

[Arek Wróbel]

Nevermind,  i made this working.

[Arek Wróbel]

Nevermind, I did not.