Java Networking

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

import javax.swing.JFrame;
import javax.swing.JTextArea;


public class Server {

    //GUI Objects:
    private JFrame frame = new JFrame("Server");
    private JTextArea txtArea = new JTextArea();

    //Server Objects:
    private ServerSocket serverSocket;
    private Socket socket;

    public Server() throws IOException {
        //Frame Attributes:
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.setResizable(false);
        frame.setSize(400, 600);
        frame.setLayout(null);

        //txtArea Attributes:
        txtArea.setSize(360, 500);
        txtArea.setLocation(15, 10);

        //Add Objects To Frame:
        frame.add(txtArea);

        //Open Server On Port 7777:
        serverSocket = new ServerSocket(7777);

        //Wait For Clients:
        while(true){
            socket = serverSocket.accept();
            ServerThread sThread = new ServerThread(socket, txtArea);
            sThread.start();
        }
    }

    public static void main(String[] args) throws IOException {
         new Server();
    }

}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

import javax.swing.JTextArea;


public class ServerThread extends Thread {

    private Socket socket;
    private JTextArea txt;
    private String message = null;
    private BufferedReader br;

    public ServerThread(Socket newSock, JTextArea newTxt) {
        this.socket = newSock;
        this.txt = newTxt;
    }

    public void run(){
        try {
            br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            message = br.readLine();
            txt.append("Client: " + message + "\n");
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.swing.JFrame;
import javax.swing.JTextField;


public class Client {

    //GUI Objects:
    private JFrame frame = new JFrame("Client");
    private JTextField txtMessage = new JTextField();

    //Client Objects:
    private Socket socket;
    private String message;
    private PrintWriter printWriter;

    public Client() {
        //Frame Attributes:
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.setResizable(false);
        frame.setSize(400, 600);
        frame.setLayout(null);

        //txtMessage Attributes:
        txtMessage.setSize(360, 25);
        txtMessage.setLocation(10, 15);

        //txtMessage Event:
        txtMessage.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent arg0) {
                try {
                    //Open Client On Port 7777:
                    socket = new Socket("localhost", 7777);
                    printWriter = new PrintWriter(socket.getOutputStream(), true);
                    message = txtMessage.getText();
                    printWriter.println(message);
                    txtMessage.setText("");
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                } catch (IOException e) {

                    e.printStackTrace();
                }
            }
        });

        //Add Objects To Frame:
        frame.add(txtMessage);
    }

    public static void main(String[] args) {
        new Client();
    }

}