Java客户端/服务器套接字程序-服务器不响应客户端请求

我正在尝试测试Oracle提供的Client / Server教程示例，并进行了一些小的调整。

理想情况下，我会将“打印内容”写入stdIn客户端的BufferedReader中，并且服务器在接收到此字符串后将打印“客户端和服务器已连接！”。

我的代码编译了，看来连接成功了。但是，我的服务器目前不打印任何内容。

以下是我的客户代码：

public class myClient {

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

    String hostName = // my computer's local host name;
    int portNumber = 4444;

    try ( 
        Socket clientSocket = new Socket(hostName, portNumber);
        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
    ) {
        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));

        // Tell server to print line "Client and server have connected!";
        String fromServer;
        String fromUser;

        while ((fromServer = in.readLine()) != null) {
            if (fromServer.equals("End"))
                break;

            fromUser = stdIn.readLine();

            if (fromUser != null)
                out.println(fromUser);
        }

    } catch (UnknownHostException e) {
        System.err.println("Don't know host!");
        System.exit(1);
    } catch (IOException e) {
        System.err.println("IO Exception caught!");
        System.exit(1);
    }

}

}

以下是我的服务器代码：

public class myServer {

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

    int portNumber = 4444;

    try (
        ServerSocket serverSocket = new ServerSocket(portNumber);
        Socket clientSocket = serverSocket.accept();

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

        // if receieved string is "print stuff", print "Client and server have connected!";
        String inputLine;

        while ((inputLine = in.readLine()) != null) {
            if (inputLine.equals("End"))
                break;

            // try to echo input stream - no output!
            out.println(inputLine);

            if (inputLine.equals("print stuff"))
                out.println("Client and server have connected!");
        }

    } catch(IOException e) {
        System.err.println("Exception caught while trying to listen to port!");
    }

}

}