简单客户端 - 服务器程序

Question

我试图使用java套接字创建一个简单的客户端 - 服务器程序。客户端和服务器从控制台发送他们从键盘接收的其他号码。但是，在客户端从服务器收到号码并尝试下一个号码后，服务器没有从客户端接收号码并且程序冻结。我是Java的初学者，我不知道自己做错了什么。

服务器代码：

import java.io.IOException;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class TicServer
{
    private boolean myTurn ;
    private ServerSocket sock;
    private Socket s;
    private Scanner input;
    private PrintStream output;
    private Scanner sc;

    public TicServer() throws UnknownHostException, IOException
    {
        myTurn = false;
        sock = new ServerSocket(9001);
        s = null;
        sc = new Scanner(System.in);
    }

    public void run() throws IOException
    {
        while(true)
        {
            if(this.myTurn == true)
            {
                int pos;
                this.myTurn = false;
                System.out.println("(Server) Insert number: ");
                pos = sc.nextInt();
                output.println(pos);
            }
            else
            {
                int pos;
                this.myTurn = true;
                s = sock.accept();
                input = new Scanner(s.getInputStream());
                output = new PrintStream(s.getOutputStream());
                pos = input.nextInt();
                System.out.println("Server received: " + pos);
            }
        }
    }

    private void close() throws IOException
    {
        this.sock.close();
        this.sc.close();
        this.input.close();
        this.output.close();
    }
    public static void main(String args[]) 
    {
        TicServer ts = null;
        try
        {
            ts = new TicServer();
            ts.run();
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        finally
        {
            try
            {
                ts.close();
            }
            catch(Exception ex)
            {
                ex.printStackTrace();
            }
        }
    }
}

和客户端代码：

import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class TicClient 
{
    private boolean myTurn ;
    private Socket sock;
    private Scanner input;
    private PrintStream output;
    private Scanner sc;

    public TicClient() throws UnknownHostException, IOException
    {
        myTurn = true;
        sock = new Socket("127.0.0.1", 9001);
        sc = new Scanner(System.in);
        input = new Scanner(sock.getInputStream());
        output = new PrintStream(sock.getOutputStream());
    }

    public void run()
    {
        while(true)
        {
            if(this.myTurn == true)
            {
                int pos;
                this.myTurn = false;
                System.out.println("(client)Insert number: ");
                sc = new Scanner(System.in);
                pos = sc.nextInt();
                output.println(pos);
            }
            else
            {
                int pos;
                this.myTurn = true;
                pos = input.nextInt();
                System.out.println("Client received: " + pos);
            }
        }
    }
    private void close() throws IOException
    {
        this.sock.close();
        this.sc.close();
        this.input.close();
        this.output.close();
    }
    public static void main(String args[]) 
    {
        TicClient tc = null;
        try
        {
            tc = new TicClient();
            tc.run();
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        finally
        {
            try
            {
                tc.close();
            }
            catch(Exception ex)
            {
                ex.printStackTrace();
            }
        }
    }
}

我使用Eclipse在同一台计算机上运行这两个程序。