nt.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferStrategy;
import javax.swing.*;

public class Ventana extends Canvas
{
       public final int ANCHO = 600;
       public final int ALTO = 730;
       public int ANpanel=ANCHO-5;
       public int ALpanel=ALTO;
       public BufferStrategy strategy;

       Pelota p;
       int ancho;
       int alto;

       public static void main(String[] args)
       {
               new Ventana();
       }

       public Ventana()
       {
               JFrame ventana = new JFrame("...LABERINTO...");
               ventana.setBounds(0,0,ANCHO,ALTO);
               ventana.setLocation (10,10);
               JPanel panel = (JPanel)ventana.getContentPane();
               panel.setPreferredSize(new Dimension(ANpanel,ALpanel));
               setBounds(0,0,ANpanel,ALpanel);
               panel.setLayout(null);
               panel.add(this);
               panel.setBackground(Color.darkGray);
               ventana.setVisible(true);
               ventana.addWindowListener( new WindowAdapter()
               {
                       public void windowClosing(WindowEvent e)
                       {
                               System.exit(0);
                       }
               });
               ventana.setResizable(false);
               createBufferStrategy(2);
           strategy = getBufferStrategy();
           requestFocus();
//          addKeyListener(this);

           Pelota pelotaRoja = new Pelota(ancho, alto);
               pelotaRoja.start();
       }

       public void paintComponent ()
       {       System.out.println("dentro de paint ");
               Graphics g = strategy.getDrawGraphics();

               g.setColor(getBackground());
               g.fillRect(0,0,ANpanel,ALpanel);

               g.setColor(Color.red);
               g.fillOval(12, 12,12, 12);

               strategy.show();
       }
}
*************************************************************************************************************
CLASE PELOTA


public class Pelota extends Thread
{
       Ventana v;
       int ancho;
       int alto;
       int posX=10;
       int posY=10;
       int vX=1;
       int vY=2;

       public Pelota (int ancho, int alto)
       {
               this.ancho = ancho;
               this.alto = alto;
       }

       public void run()
       {
               while(true)
               {
//                      detectarcolision();
                       mover();
                       System.out.println("llamo al game ");
                       game();

                       try
                       {
                               Thread.sleep(20);
                       }
                       catch (InterruptedException e)
                       {
                               e.printStackTrace();
                       }
               }
       }

       public void detectarcolision()
       {
               if ((posX<0)||(posX>v.ANpanel-ancho))
               {
                       vX=-vX;
               }
       }

       public void mover()
       {
               posX = posX + vX;
       }

       public void game()
       { System.out.println("llamo al paint ");
               v.repaint();
       }



}