Chat Server

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.FlowLayout;
import java.awt.BorderLayout;
import javax.swing.JOptionPane;
import java.awt.event.*;
import javax.swing.*;

import java.util.*;
import java.awt.*;

import java.io.*;
import java.net.*;

public class Server //change main class name
{
    static JFrame chatFrame = new JFrame("ChatNow Server"); // Create a frame
    static JTextArea JTextArea_group = new JTextArea("Here goes the conversation\n", 15, 80);
    static NetworkServerModule networkServerModule;
    static String serverHandle = JOptionPane.showInputDialog("Please choose your handle");

    public static void main(String[] args)
    {
        chatFrame.setSize(900, 400); // Set the frame size
        chatFrame.setLocationRelativeTo(null);
        chatFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        chatFrame.setVisible(true); // Display the frame


        FlowLayout layoutManager = new FlowLayout(0,10,5);
        chatFrame.setLayout(layoutManager);


//        JTextArea JTextArea_group = new JTextArea("Here goes the conversation", 15, 80);
        JTextArea_group.setLineWrap(true);
        JTextArea_group.setWrapStyleWord(true);
        JTextArea_group.setEditable(false);

        //chatFrame.add(JTextArea_group);


        /* here add scroll to JTextArea - actually JScrollpane takes JTextArea */
        JScrollPane scrollPane = new JScrollPane(JTextArea_group);
        chatFrame.add(scrollPane);



        JTextField_group JTF = new JTextField_group();
        networkServerModule = new NetworkServerModule();

   }
 }

class JTextField_group
{
    JTextField TextFieldChatInput = new JTextField(80);

    JTextField_group()
    {
        Server.chatFrame.add(TextFieldChatInput);
        TextFieldChatInput.setText("Does some text show up?");

        TextFieldChatInput.addActionListener(new messageTextInputListener());
    }

    class messageTextInputListener implements ActionListener
    {
        @Override
        public void actionPerformed(ActionEvent e)
        {
            /*
            JOptionPane.showMessageDialog(null, "The text you entered is: " + TextFieldChatInput.getText());
            ChatGUI.JTextArea_group.setText( TextFieldChatInput.getText() );
            */

            String IhaveTextOfChatInput = TextFieldChatInput.getText();
            Server.JTextArea_group.append(Server.serverHandle + ": " + "\n");
            Server.JTextArea_group.append(IhaveTextOfChatInput + "\n");
            TextFieldChatInput.setText("");

            if (NetworkServerModule.oClient != null)
            {
                NetworkServerModule.oClient.println(Server.serverHandle + ": ");
                NetworkServerModule.oClient.println(IhaveTextOfChatInput);
                NetworkServerModule.oClient.flush();
            }

        }
    }
}

class NetworkServerModule
{

    ServerSocket serverSocket;
    Socket socket;

    static DataInputStream iClient;
    static PrintWriter oClient;

    NetworkServerModule()
    {
        try
        {
            serverSocket = new ServerSocket(8000);
            socket = serverSocket.accept();

            iClient = new DataInputStream(socket.getInputStream());
            oClient = new PrintWriter(socket.getOutputStream());

            for(int start = 0; start < 1000 ;start++)     ////////////////////////////////////while(true)
            {
               waitA();

               String textFromClient = iClient.readLine();         ////// maybe need if-statement   // writeUTF     readUTF
               if (textFromClient != null)
                   Server.JTextArea_group.append(textFromClient + "\n");
            }


        }

        catch(IOException ex)
        {
            System.err.println(ex);
        }

    }

    void waitA()
    {
        try
        {
            Thread.sleep(300);
        }

        catch(InterruptedException ex)
        {
            Thread.currentThread().interrupt();
        }
    }
}