发送和接收DatagramPackets无法正常工作

Question

致力于小型视频游戏多人游戏。第一个玩家是服务器，第二个是客户端。我在客户端和服务器上都有2个方法networkSend（）和networkRecive（）。如果我只使用服务器networkReceive（）和客户端networkSend（），我可以看到我的船只移动。但是如果我在服务器和客户端都使用它们，那么我就无法移动任何船只。看起来像networkRecieve（）等待响应我猜。如何使它们兼具？

第一个玩家和第二个玩家包含几乎相同的代码

 // network variables
String ip;
InetAddress address = null;
byte[] buf = new byte[256];
int port = 5001;
DatagramSocket socket = null;
DatagramPacket packet = null;

public Board() {

    addKeyListener(new TAdapter());
    setFocusable(true);
    setBackground(Color.BLACK);
    setDoubleBuffered(true);

    craft = new Craft();
    enemy = new Enemy();

    timer = new Timer(5, this);
    timer.start();

 // DatagramSocket socketS;
    try {
        socket = new DatagramSocket(5001);
        System.out.println("Socket created on "+ port + " port");
    } catch (SocketException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    System.out.println("Starting server...");
}

public void actionPerformed(ActionEvent e) {
    craft.move();
   // enemy.move();

    networkReceive();
    // if networkSend() is commented than it works 
    networkSend();

    repaint();  
}


private class TAdapter extends KeyAdapter {

    public void keyReleased(KeyEvent e) {
        craft.keyReleased(e);
    }

    public void keyPressed(KeyEvent e) {
        craft.keyPressed(e);
    }
}

  public void networkSend(){

    // Serialize to a byte array
    try {
                ByteArrayOutputStream bStream = new ByteArrayOutputStream();
                ObjectOutputStream oo;
                oo = new ObjectOutputStream(bStream);
                oo.writeObject(craft);

                oo.flush();
                oo.close();

                byte[] bufCar = bStream.toByteArray();
                DatagramPacket packet = new DatagramPacket(bufCar, bufCar.length, address, port);
                socket.send(packet);

    } catch (IOException e) {   
        // TODO Auto-generated catch block
        e.printStackTrace();
    } 

}


  public void networkReceive() {


    try {

                DatagramPacket packet = new DatagramPacket(buf, buf.length);
                System.out.println("Printing buf="+buf+" and socket "+socket);
                socket.receive(packet);

                 byte[] data = packet.getData();
                    ByteArrayInputStream in = new ByteArrayInputStream(data);
                    ObjectInputStream is = new ObjectInputStream(in);
                        enemy = (Enemy) is.readObject();
                       System.out.println("Enemy x="+enemy.getX()+" and y="+enemy.getY());
                        address = InetAddress.getLocalHost();
                        port    = packet.getPort();

    } catch (IOException | ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


}