Socket Server

import java.awt.BorderLayout;
import javax.swing.*;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class Servidor  {
    public static void main(String[] args) {
        MarcoServidor Marco=new MarcoServidor();
        Marco.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}
class MarcoServidor extends JFrame implements Runnable{
    public MarcoServidor(){
        setBounds(1200,300,280,350);
        JPanel milamina= new JPanel();
        milamina.setLayout(new BorderLayout());
        areatexto=new JTextArea();
        milamina.add(areatexto,BorderLayout.CENTER);
        add(milamina);
        setVisible(true);
        Thread SocketHilo = new Thread(this);
        SocketHilo.start();
    }
    public void run(){
        try {
            ServerSocket ServidorSocket = new ServerSocket(9000);
            while(true){
                try (Socket Socket = ServidorSocket.accept()) {
                    DataInputStream entrada=new DataInputStream(Socket.getInputStream());
                    String Texto = entrada.readUTF();
                    areatexto.append("\n" + Texto);
                }
            }
        } catch (IOException ex) {
            System.out.println(ex.getMessage());
        }
    }
    private JTextArea areatexto;
}