Help me to make my game working as Applet

Question

here is the working code
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;
public class Arkanoid extends Canvas implements Runnable
   public BufferStrategy buforowanie;
   public BufferedImage statek, kulka, tlo, klocek;
   Thread thread;
   public int x = 100, y, x_kulki = 500, y_kulki = 580;
   public int lewo_prawo = (int)(10 * Math.random()), gora_dol = -3, x_klocka = 0, y_klocka = 0;
   public Window win;
   Graphics g;
   public boolean[][] jest_czy_nie;
   public Rectangle[][] klocki;
   public Rectangle[][] klocki_gora;
   public Rectangle[][] klocki_dol;
   public Rectangle[][] klocki_lewo;
   public Rectangle[][] klocki_prawo;
   public boolean czy_zbite = false;
   public int szybkosc = 5;
   public Arkanoid()
      statek = loadImage("statek.gif");
      kulka = loadImage("kulka.gif");  
      tlo = loadImage("8.jpg");
      klocek = loadImage("klocek.gif");
      start();     
      requestFocus();
      jest_czy_nie = new boolean[10][10];
      klocki = new Rectangle[10][10];
      klocki_gora = new Rectangle[10][10];
      klocki_dol = new Rectangle[10][10];
      klocki_lewo = new Rectangle[10][10];
      klocki_prawo = new Rectangle[10][10];
      for (int i = 0; i < 10; i++)
               for (int j = 0; j < 10; j++)
                 jest_czy_nie[i][j] = true;
                 klocki_gora[i][j] = zwroc_wsp_gory(klocek, 100 * i, 20 * j);
                 klocki_dol[i][j] = zwroc_wsp_dolu(klocek, 100 * i, 20 * j);
                 klocki_lewo[i][j] = zwroc_wsp_lewa(klocek, 100 * i, 20 * j);
                 klocki_prawo[i][j] = zwroc_wsp_prawa(klocek, 100 * i, 20 * j);
   public BufferedImage loadImage(String sciezka)
        URL url = null;
        try
           url = getClass().getClassLoader().getResource(sciezka);
           return ImageIO.read(url);
        catch (Exception e)
             System.out.println("w pizdeczke");
             System.exit(0);
            return null;
   public Rectangle zwroc_wsp(BufferedImage obrazek, int x, int y)
      int a, b;
      BufferedImage image;
      a = x;
      b = y;
      image = obrazek;
      return new Rectangle(a, b, image.getWidth(), image.getHeight());
   public Rectangle zwroc_wsp_gory(BufferedImage obrazek, int x, int y)
      int a, b;
      BufferedImage image;
      a = x;
      b = y;
      image = obrazek;
      return new Rectangle(a, b, 100, 3);
   public Rectangle zwroc_wsp_dolu(BufferedImage obrazek, int x, int y)
      int a, b;
      BufferedImage image;
      a = x;
      b = y;
      image = obrazek;
      return new Rectangle(a, b + 17, 100, 3);
   public Rectangle zwroc_wsp_lewa(BufferedImage obrazek, int x, int y)
      int a, b;
      BufferedImage image;
      a = x;
      b = y;
      image = obrazek;
      return new Rectangle(a, b + 3 , 3, 14);
   public Rectangle zwroc_wsp_prawa(BufferedImage obrazek, int x, int y)
      int a, b;
      BufferedImage image;
      a = x;
      b = y;
      image = obrazek;
      return new Rectangle(a + 97, b + 3 , 3, 14);
   public void run()
      Graphics g = buforowanie.getDrawGraphics();
      g.drawImage(tlo , 0, 0, 1000, 700, 0, 0, 1000, 700, this);
      int i = -1;
      int j = -1;
      Graphics2D g2 = (Graphics2D)g;
      for (i = 0; i < 10; i++)
           for (j = 0; j < 10; j++) 
           if (jest_czy_nie[i][j] == true)
           g.drawImage(klocek, 100*i, 20 * j, 100, 20, null);
           j = 0;
      while (true)
       if (x > 880) x = 880;
       g.drawImage(tlo , 0, 600, 1000, 620,  0, 600, 1000, 620, this);
       g.drawImage(tlo , x_kulki, y_kulki, x_kulki + 20, y_kulki + 20,  x_kulki, y_kulki , x_kulki + 20, y_kulki + 20, this);
       x_kulki = x_kulki + lewo_prawo;
       y_kulki = y_kulki + gora_dol;
       if (x_kulki < 0) lewo_prawo = -lewo_prawo;
       if (x_kulki > 1000) lewo_prawo = -lewo_prawo;
       if (y_kulki < 0) gora_dol = - gora_dol;
       if (y_kulki > 700) System.exit(0);
       g.drawImage(statek , x, 600, this);
       g.drawImage(kulka , x_kulki, y_kulki, this);
       Rectangle statek_wsp = zwroc_wsp(statek, x, 600);
       Rectangle kulka_wsp = zwroc_wsp(kulka, x_kulki, y_kulki);
       if (statek_wsp.intersects(kulka_wsp))
            gora_dol = - gora_dol;
            lewo_prawo = (int)(((x_kulki - x) - 50)/10);
       for (i = 0; i < 10; i++)
           for (j = 0; j < 10; j++)
              if (kulka_wsp.intersects(klocki_lewo[i][j]) && (jest_czy_nie[i][j] == true) && (czy_zbite == false))
                   g.drawImage(tlo , 100 * i, 20 * j, 100 * i + 100, 20 * j + 20,  100 * i, 20 * j, 100 * i + 100, 20 * j + 20, this);
                   lewo_prawo = - lewo_prawo;
                   jest_czy_nie[i][j] = false;
                   System.out.println("lewo");     
                   czy_zbite = true;
               else
               if (kulka_wsp.intersects(klocki_prawo[i][j]) && (jest_czy_nie[i][j] == true)&& (czy_zbite == false))
                    g.drawImage(tlo , 100 * i, 20 * j, 100 * i + 100, 20 * j + 20,  100 * i, 20 * j, 100 * i + 100, 20 * j + 20, this);
                    lewo_prawo = - lewo_prawo;
                      jest_czy_nie[i][j] = false;
                      System.out.println("prawo");      
                      czy_zbite = true;
               else
               if (kulka_wsp.intersects(klocki_dol[i][j]) && (jest_czy_nie[i][j] == true)&& (czy_zbite == false))
                    g.drawImage(tlo , 100 * i, 20 * j, 100 * i + 100, 20 * j + 20,  100 * i, 20 * j, 100 * i + 100, 20 * j + 20, this);
                       gora_dol = - gora_dol;
                      jest_czy_nie[i][j] = false;
                      System.out.println("dol");
                   czy_zbite = true;
               else   
               if (kulka_wsp.intersects(klocki_gora[i][j]) && (jest_czy_nie[i][j] == true)&& (czy_zbite == false))
                   g.drawImage(tlo , 100 * i, 20 * j, 100 * i + 100, 20 * j + 20,  100 * i, 20 * j, 100 * i + 100, 20 * j + 20, this);
                     gora_dol = - gora_dol;
                    jest_czy_nie[i][j] = false;
                   System.out.println("gora");     
                   czy_zbite = true;
           j = 0;
       czy_zbite = false;
       buforowanie.show();
      try
          Thread.sleep(szybkosc);
      catch (InterruptedException e)
          System.out.println("interrupt");
   public void start()
      thread = new Thread(this);
     thread.start(); 
   public void stop()
     thread.stop(); 
   /*public static void main(String[] args)
       Arkanoid panel = new Arkanoid();
        Frame frame = new Frame();
           //frame.setUndecorated(true);
        GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice device = environment.getDefaultScreenDevice(); 
        GraphicsConfiguration configuration = device.getDefaultConfiguration();
        device.setFullScreenWindow(frame);
        Graphics g = device.getFullScreenWindow().getGraphics();
           frame.setSize(1000,700);
        frame.add(panel);
        frame.setVisible(true);
       panel.createBufferStrategy(2);
       panel.buforowanie = panel.getBufferStrategy();
       Klawisze s&#322;uchacz_klawiszy = new Klawisze(panel);
       frame.addKeyListener(s&#322;uchacz_klawiszy);
       Mysz s&#322;uchacz_myszy = new Mysz(panel);
       panel.addMouseMotionListener(s&#322;uchacz_myszy);
       Cursor invisibleCursor = Toolkit.getDefaultToolkit().createCustomCursor(Toolkit.getDefaultToolkit().getImage(""), new Point(0, 0), "invisible");
           panel.setCursor(invisibleCursor);
}and here the applet
import java.awt.*;
import javax.swing.*;
public class Applet extends JApplet
  public void init()
       Arkanoid panel = new Arkanoid();
       Container pow = getContentPane();
       pow.add(panel);
       panel.setSize(1000,700);
      panel.createBufferStrategy(2);
      panel.buforowanie = panel.getBufferStrategy();
      Klawisze s&#322;uchacz_klawiszy = new Klawisze(panel);
      panel.addKeyListener(s&#322;uchacz_klawiszy);
      Mysz s&#322;uchacz_myszy = new Mysz(panel);
      panel.addMouseMotionListener(s&#322;uchacz_myszy);
      Cursor invisibleCursor = Toolkit.getDefaultToolkit().createCustomCursor(Toolkit.getDefaultToolkit().getImage(""), new Point(0, 0), "invisible");
         panel.setCursor(invisibleCursor);
}the game is working well so i decided to share it and put it somewhere in the internet
there are also 2 mouse and key listener classes respectively but as far as iam convinced they dont affect the problem i am getting at all
here is the exception thats thrown while i try to run that
Exception in thread "Thread-3" java.lang.NullPointerException
     at Arkanoid.run(Arkanoid.java:133)
     at java.lang.Thread.run(Unknown Source)
line 133 refers to this : at Arkanoid.run(Arkanoid.java:133)
thanks in advance, Lukasz
null
null

Answer 1

The use of thread.stop() is not recommended. You can find out why by looking the method up
in the Thread class api. It includes a link into the guide for more details.
//  <applet code="A2" width="1000" height="700"></applet>
//  use: >appletviewer A2.java
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
public class A2 extends Applet
    A2Canvas canvas;
    public void init()
        canvas = new A2Canvas();
        setLayout(new BorderLayout());
        add(canvas);
    public void start()
        canvas.start();
    public void stop()
        canvas.stop();
    public static void main(String[] args)
        Applet applet = new A2();
        Frame frame = new Frame();
        frame.addWindowListener(closer);
        frame.add(applet);
        frame.setSize(1000,700);
        applet.init();
        frame.setVisible(true);
        applet.start();
    private static WindowListener closer = new WindowAdapter()
        public void windowClosing(WindowEvent e)
            System.exit(0);
class A2Canvas extends Canvas implements Runnable
    public BufferStrategy buforowanie;
    public BufferedImage statek, kulka, tlo, klocek;
    Thread thread;
    public int
        x = 100,
        y,
        x_kulki = 500,
        y_kulki = 580;
    public int
        lewo_prawo = (int)(10 * Math.random()),
        gora_dol = -3,
        x_klocka = 0,
        y_klocka = 0;
    public boolean[][] jest_czy_nie;
    public Rectangle[][] klocki;
    public Rectangle[][] klocki_gora;
    public Rectangle[][] klocki_dol;
    public Rectangle[][] klocki_lewo;
    public Rectangle[][] klocki_prawo;
    public boolean czy_zbite = false;
    public int szybkosc = 100;
    public A2Canvas()
        statek = loadImage("statek.gif");
        kulka = loadImage("kulka.gif");  
        tlo = loadImage("8.jpg");
        klocek = loadImage("klocek.gif");
        // In your original (posted) application:
        // Calling start (here) before construction is complete
        // results in a NullPointerException in the run method
        // because buforowanie is initialized in the main method
        // after construction, ie, after this class instance has
        // been created. For success, move this call to the end
        // of your main method, ie, panel.start().
//        start();
        // Not recommended, see api for explanation.
//        requestFocus();
        // This is recommended instead, see api.
        requestFocusInWindow();
        // Arrange for this to be focusable.
        setFocusable(true);
        jest_czy_nie = new boolean[10][10];
        klocki = new Rectangle[10][10];
        klocki_gora = new Rectangle[10][10];
        klocki_dol = new Rectangle[10][10];
        klocki_lewo = new Rectangle[10][10];
        klocki_prawo = new Rectangle[10][10];
        for (int i = 0; i < 10; i++)
            for (int j = 0; j < 10; j++)
                jest_czy_nie[i][j] = true;
                klocki_gora[i][j] = zwroc_wsp_gory(klocek, 100 * i, 20 * j);
                klocki_dol[i][j] = zwroc_wsp_dolu(klocek, 100 * i, 20 * j);
                klocki_lewo[i][j] = zwroc_wsp_lewa(klocek, 100 * i, 20 * j);
                klocki_prawo[i][j] = zwroc_wsp_prawa(klocek, 100 * i, 20 * j);
    public BufferedImage loadImage(String sciezka)
        URL url = null;
        try
            url = getClass().getClassLoader().getResource(sciezka);
            return ImageIO.read(url);
        catch (Exception e)
            System.out.println("w pizdeczke " + sciezka);
            System.exit(0);
            return null;
    public Rectangle zwroc_wsp(BufferedImage obrazek, int x, int y)
        int a, b;
        BufferedImage image;
        a = x;
        b = y;
        image = obrazek;
        return new Rectangle(a, b, image.getWidth(), image.getHeight());
    public Rectangle zwroc_wsp_gory(BufferedImage obrazek, int x, int y)
        int a, b;
        BufferedImage image;
        a = x;
        b = y;
        image = obrazek;
        return new Rectangle(a, b, 100, 3);
    public Rectangle zwroc_wsp_dolu(BufferedImage obrazek, int x, int y)
        int a, b;
        BufferedImage image;
        a = x;
        b = y;
        image = obrazek;
        return new Rectangle(a, b + 17, 100, 3);
    public Rectangle zwroc_wsp_lewa(BufferedImage obrazek, int x, int y)
        int a, b;
        BufferedImage image;
        a = x;
        b = y;
        image = obrazek;
        return new Rectangle(a, b + 3 , 3, 14);
    public Rectangle zwroc_wsp_prawa(BufferedImage obrazek, int x, int y)
        int a, b;
        BufferedImage image;
        a = x;
        b = y;
        image = obrazek;
        return new Rectangle(a + 97, b + 3 , 3, 14);
    public void run()
        Graphics g = buforowanie.getDrawGraphics();
        g.drawImage(tlo , 0, 0, 1000, 700, 0, 0, 1000, 700, this);
        int i = -1;
        int j = -1;
        Graphics2D g2 = (Graphics2D)g;
        for (i = 0; i < 10; i++)
            for (j = 0; j < 10; j++) 
                if (jest_czy_nie[i][j] == true)
                    g.drawImage(klocek, 100*i, 20 * j, 100, 20, null);
            j = 0;
        while (true)
            if (x > 880) x = 880;
            g.drawImage(tlo , 0, 600, 1000, 620,  0, 600, 1000, 620, this);
            g.drawImage(tlo , x_kulki, y_kulki, x_kulki + 20, y_kulki + 20,
                        x_kulki, y_kulki , x_kulki + 20, y_kulki + 20, this);
            x_kulki = x_kulki + lewo_prawo;
            y_kulki = y_kulki + gora_dol;
            if (x_kulki < 0) lewo_prawo = -lewo_prawo;
            if (x_kulki > 1000) lewo_prawo = -lewo_prawo;
            if (y_kulki < 0) gora_dol = - gora_dol;
            if (y_kulki > 700) System.exit(0);
            g.drawImage(statek , x, 600, this);
            g.drawImage(kulka , x_kulki, y_kulki, this);
            Rectangle statek_wsp = zwroc_wsp(statek, x, 600);
            Rectangle kulka_wsp = zwroc_wsp(kulka, x_kulki, y_kulki);
            if (statek_wsp.intersects(kulka_wsp))
                gora_dol= - gora_dol;
                lewo_prawo = (int)(((x_kulki - x) - 50)/10);
            for (i = 0; i < 10; i++)
                for (j = 0; j < 10; j++)
                    if (kulka_wsp.intersects(klocki_lewo[i][j]) &&
                            jest_czy_nie[i][j] && !czy_zbite)
                        g.drawImage(tlo , 100 * i, 20 * j, 100 * i + 100, 20 * j + 20,
                                    100 * i, 20 * j, 100 * i + 100, 20 * j + 20, this);
                        lewo_prawo = - lewo_prawo;
                        jest_czy_nie[i][j] = false;
                        System.out.println("lewo");     
                        czy_zbite = true;
                    else if (kulka_wsp.intersects(klocki_prawo[i][j]) &&
                            jest_czy_nie[i][j] && !czy_zbite)
                        g.drawImage(tlo , 100 * i, 20 * j, 100 * i + 100, 20 * j + 20,
                                    100 * i, 20 * j, 100 * i + 100, 20 * j + 20, this);
                        lewo_prawo = - lewo_prawo;
                        jest_czy_nie[i][j] = false;
                        System.out.println("prawo");      
                        czy_zbite = true;
                    else if (kulka_wsp.intersects(klocki_dol[i][j]) &&
                            jest_czy_nie[i][j] && !czy_zbite)
                        g.drawImage(tlo , 100 * i, 20 * j, 100 * i + 100, 20 * j + 20,
                                    100 * i, 20 * j, 100 * i + 100, 20 * j + 20, this);
                        gora_dol = - gora_dol;
                        jest_czy_nie[i][j] = false;
                        System.out.println("dol");
                        czy_zbite = true;
                    else if (kulka_wsp.intersects(klocki_gora[i][j]) &&
                            jest_czy_nie[i][j] && !czy_zbite)
                        g.drawImage(tlo , 100 * i, 20 * j, 100 * i + 100, 20 * j + 20,
                                    100 * i, 20 * j, 100 * i + 100, 20 * j + 20, this);
                        gora_dol = - gora_dol;
                        jest_czy_nie[i][j] = false;
                        System.out.println("gora");     
                        czy_zbite = true;
                j = 0;
            czy_zbite = false;
            buforowanie.show();
            try
                Thread.sleep(szybkosc);
            catch (InterruptedException e)
                System.out.println("interrupt");
                break;  // We need to exit this loop now.
    public void start()
        if(buforowanie == null)
            createBufferStrategy(2);
            buforowanie = getBufferStrategy();
        thread = new Thread(this);
        thread.start(); 
    public void stop()
        thread.interrupt(); 
        thread = null;
}