Einfache Server/Client Socket-Verbindung?

Ich Schreibe ein java-socket, wo ein server läuft und ein client verbindet sich zum server und der server Lesen kann von den Kunden Befehlszeile.

Zuerst wollte ich die Verbindung zum server, hier der code:

public class Server{
    public static void main(String[] args) throws IOException {

        ServerSocket serverSocket = null;

        try {
            serverSocket = new ServerSocket(10000);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 4444.");
            e.printStackTrace();
            System.exit(1);
        }

        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }

        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        String inputLine, outputLine;

        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
    }

}

und hier ist mein client:

public class Client {
    public static void main(String[] args) throws IOException {

        Socket socket = null;
        PrintWriter out = null;
        BufferedReader in = null;

        try {
            socket = new Socket("taranis", 4444);
            out = new PrintWriter(socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Don't know about host: taranis.");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to: taranis.");
            System.exit(1);
        }

        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
        String fromServer;
        String fromUser;

        while ((fromServer = in.readLine()) != null) {
            System.out.println("Server: " + fromServer);
            if (fromServer.equals("Bye."))
                break;

            fromUser = stdIn.readLine();
            if (fromUser != null) {
                System.out.println("Client: " + fromUser);
                out.println(fromUser);
            }
        }

        out.close();
        in.close();
        stdIn.close();
        socket.close();
    }
}

Wenn ich den server starten, bekomme ich "could not listen on port: 4444."

Warum?

UPDATE:

Recht, jetzt kann ich Sie nicht neu starten den server erneut, da bekomme ich

java.net.BindException: Address already in use: JVM_Bind
    at java.net.DualStackPlainSocketImpl.bind0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketBind(Unknown Source)
    at java.net.AbstractPlainSocketImpl.bind(Unknown Source)
    at java.net.PlainSocketImpl.bind(Unknown Source)
    at java.net.ServerSocket.bind(Unknown Source)
    at java.net.ServerSocket.<init>(Unknown Source)
    at java.net.ServerSocket.<init>(Unknown Source)

Was kann ich dagegen tun?(Ich bin mit windows7)

InformationsquelleAutor maximus | 2012-10-10