التحكم في Java Object باستخدام Sockets

السلام عليكم ، اريد كتابة برنامج بلفة جافا مستخدما الــSockets الفكرة الأساسية للبرنامج هي أن يقوم زبون (client) بالاتصال بــخادم (server) ، وذلك ليتحكم بكرة عن طريق لوحة المفاتيح (ببساطة عندما يستخدم الزبون لوحة مفاتيحه تتحرك كرته و كرة الخادم في نفس الوقت)، لقد قمت بكتابة البرنامج المشكلة هي أن عند تشغيله التحكم يتم في نافذة واحدة (يعني لا توجد علاقة بين النافذتين) و لا أعرف السبب الرجاء الاطلاع على البرنامج و مساعدتي .

class ball

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Ellipse2D;


import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class balle extends JPanel implements ActionListener,KeyListener
{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    double x=0, y=0, coor_x=0, coor_y=0;
    //A facility for threads to schedule tasks for future execution in a background thread.
    Timer t=new Timer(2, this);

    /*Constructeur*/
    public balle()
    {

        t.start();
        //Adds the specified key listener to receive key events from this component.
        addKeyListener(this);
        //Sets the focusable state of this Component to the specified value. This value overrides the Component's default focusability.
        setFocusable(true);
        //Sets whether focus traversal keys are enabled for this Component.
        setFocusTraversalKeysEnabled(true);


    }


    /*Calls the UI delegate's paint method, if the UI delegate is non-null.*/
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g1=(Graphics2D) g;
        //Fills the interior of a Shape using the settings of the Graphics2D context.
        g1.fill(new Ellipse2D.Double(x,y,40,40)); //The Double class defines an ellipse specified in double precision.


    }

    /*Invoked when an action occurs.*/
    public void actionPerformed(ActionEvent e)
    {
        if(x<0){coor_x=0; x=0;}
        if(x>balle.f.getWidth()-40){coor_x=0; x=balle.f.getWidth()-55;}

        if(y<0){coor_y=0; y=0;}
        if(y>balle.f.getHeight()-40){coor_y=0; y=balle.f.getHeight()-80;}



        x=x+coor_x;
        y=y+coor_y;
        repaint(); //Repaints this component.
    }


    /*HAUT*/
    public void up()
    {

            coor_y=-1;
            coor_x=0;


    }
    /*BAS*/
    public void down()
    {
        coor_y=1;
        coor_x=0;
    }

    /*GAUCHE*/
    public void left()
    {
        coor_x=-1;
        coor_y=0;
    }

    /*DROITE*/
    public void right()
    {
        coor_x=1;
        coor_y=0;
    }

    //Called just after the user presses a key while the listened-to component has the focus.
    public void keyPressed(KeyEvent e) 
    {
        int code=e.getKeyCode();

        if(code==KeyEvent.VK_UP) //Constant for the non-numpad up arrow key.
        {

            up();
        }

        if(code==KeyEvent.VK_DOWN) //Constant for the non-numpad down arrow key.
        {
            down();
        }

        if(code==KeyEvent.VK_LEFT)  //Constant for the non-numpad left arrow key.
        {
            left();
        }

        if(code==KeyEvent.VK_RIGHT) //Constant for the non-numpad right arrow key.
        {
            right();
        }
    }

    /*nvoked when a key has been typed.*/
    public void keyTyped(KeyEvent e){}

    /*Invoked when a key has been released.*/
    public void keyReleased(KeyEvent e)
    {
        coor_x=0;
        coor_y=0;
    }
    static JFrame f=new JFrame();
    public static void lancer_la_balle()
    {

        balle l=new balle();
        f.add(l);
        f.setVisible(true);
        //Sets the operation that will happen by default when the user initiates a "close" on this frame.
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setTitle("Balle.");
        f.setSize(300,300);


    }

}

***Class server* import java.io.*; import java.net.ServerSocket; import java.net.Socket; import java.net.SocketException;

public class server {
    private ServerSocket serverSocket = null;
    private Socket socket = null;
    private ObjectOutputStream outputStream = null;


    public server() {

    }

    public void communicate() {
        try {
            serverSocket = new ServerSocket(4445);
            System.out.println("Serveur demmare..");

            socket = serverSocket.accept();

            balle balle_env= new balle();

            balle.lancer_la_balle();
            balle.f.setTitle("Balle serveur.");

            outputStream = new ObjectOutputStream(socket.getOutputStream());
            outputStream.writeObject(balle_env);
            System.out.println("balle envoye");

            socket.close();

        } catch (SocketException se) {
            System.exit(0);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        server server = new server();
        server.communicate();
    }
}


***Class Client***
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.net.SocketException;

public class client {
    private Socket socket = null;
    private ObjectInputStream inputStream = null;
    private ObjectInputStream inStream = null;
    private boolean isConnected = false;

    public client() {

    }

    public void communicate() {

        while (!isConnected) {
            try {
                socket = new Socket("localHost", 4445);
                System.out.println("Client Connecte");
                isConnected = true;


                inStream = new ObjectInputStream(socket.getInputStream());
                balle balle_recu = null;
                try {
                    balle_recu = (balle) inStream.readObject();
                } catch (ClassNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                balle.lancer_la_balle();
                balle.f.setTitle("Balle client.");




            } catch (SocketException se) {
                se.printStackTrace();
                // System.exit(0);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        client client = new client();
        client.communicate();
    }
}