public void Start() {
		ServerSocket serverSocket = null;
		Socket socket = null;

		try {
			serverSocket = new ServerSocket(7777);
			System.out.println(" ۵Ǿϴ.");

			ServerSender sender = new ServerSender(); //  sender  
			sender.start();
			//      ϳ ϱ . (receiver Ŭ̾Ʈ ŭ )

			while (true) {
				socket = serverSocket.accept(); // Ŭ̾Ʈ û ٸ
				
				ServerReceiver receiver = new ServerReceiver(socket);
				
				//   , Ŭ̾Ʈ  ϳ .
				receiver.start();

			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	} // start()