网络编程TCP线程模拟报异常

Question

问题遇到的现象和发生背景

UDP线程模拟可以实现，为何TCP不行？

运行结果及报错内容

运行报出链接异常

问题相关代码，请勿粘贴截图

package sendandreceive;
import java.io.*;
import java.net.*;
class Client implements Runnable{
    private Socket s;
    Client(Socket s){
        this.s=s;
    }
    public void run() {
        try {
        BufferedReader br=new BufferedReader(
                new InputStreamReader(System.in));
        PrintWriter pw=new PrintWriter(s.getOutputStream(),true);
        String line=null;
        while((line=br.readLine())!=null) {
            if("over".equals(line)) {
                break;
            }
            pw.println(line);
        }
        br.close();
        s.close();
        }catch(Exception e) {
            e.printStackTrace();
        }
    }
}
class Server implements Runnable{
    private ServerSocket ss;
    Server(ServerSocket ss){
        this.ss=ss;
    }
    public void run() {
        try {
        Socket s=ss.accept();
        BufferedReader br=new BufferedReader(
                new InputStreamReader(s.getInputStream()));
        //PrintWriter pr=new PrintWriter(new FileWriter(""),true);
        String line=null;
        while((line=br.readLine())!=null) {
            System.out.println(line);
        }
        s.close();
        ss.close();
        }catch(Exception e) {
            e.printStackTrace();
        }
    }
}
public class TCP {
    public static void main(String[] args) throws Exception {
        Socket s =new Socket("x",10000);
        ServerSocket ss=new ServerSocket(10000);
        new Thread(new Client(s)).start();
        new Thread(new Server(ss)).start();
    }
}

TCP线程模拟实现最后报出链接异常，提示在("x",10000)这行代码上，x填写的是本机IP地址，询问一下是不能使用线程模式还是代码有错误->可Socket s=ss.accept();已创建链接，如果有错误希望指出并改正谢谢！