ClientSide

package client.side;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class ClientSide extends JFrame implements ActionListener, Runnable{
    private static final long serialVersionUID = 1L;
    Socket socket = null;
    DataInputStream is;
    DataOutputStream os;

    String name;
    static JTextField msg = new JTextField();
    private JScrollPane scp;
    static JTextArea txta1;
    JButton send = new JButton("Send");
    JButton logout = new JButton("Logout");
    boolean repeat = true;

    public ClientSide(Socket s, String name) {
        super("CLIENT SIDE WINDOW: "+name);
        setLayout(null);
        msg.setBounds(10,10,400,30);
        add(msg);
        txta1 = new JTextArea();
        scp = new JScrollPane(txta1);
        add(scp);
        send.setBounds(420,10,100,30);
        add(send);
        logout.setBounds(420,50,100,30);
        add(logout);
        txta1.setEditable(false);
        send.addActionListener(this);
        logout.addActionListener(this);
        setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        socket = s;
        this.name=name;
        try {
            is = new DataInputStream(socket.getInputStream());
            os = new DataOutputStream(socket.getOutputStream());
            String txt =name + " joined the chat";
            os.writeUTF(txt);
        }catch(IOException e) {
            System.out.println("IO ERROR");
            e.printStackTrace();
            System.exit(0);
        }
    }
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==send) {
            String txt= name+ ":" + msg.getText();
        try {
            msg.setText("");
            os.writeUTF(txt);
        }catch(IOException ex) {
            ex.printStackTrace();
        }
        }
        if(e.getSource() == logout) {
            String txt = name+ " left the chat";
            try {
                os.writeUTF(txt);
                os.writeUTF("*");
                repeat = false;
            }catch(IOException ex) {
                ex.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        int port = 9090;
        String name = JOptionPane.showInputDialog("Write your name: ");
        Socket s= null;
        try {
            s = new Socket("192.168.14.10",port);
        }catch(IOException e) {
            JOptionPane.showMessageDialog(null, "COULD NOT CONNECT THE SV\n"+e.getMessage(), "Connection error", JOptionPane.ERROR_MESSAGE);
            System.exit(0);
        }
        if(!name.trim().equals("")) {
            ClientSide client = new ClientSide(s,name);
            client.setBounds(0,0,540,400);
            client.setVisible(true);
            new Thread(client).start();
        }else {
            System.out.println("Name is clear");
        }
    }
    @Override
    public void run() {
        String txt = "";
        while(repeat) {
            try {
                txt = is.readUTF();
                txta1.setText(txt);
            }catch(IOException e) {
                JOptionPane.showMessageDialog(null, "COULD NOT CONNECT THE SV\n"+e.getMessage(), "Connection error", JOptionPane.ERROR_MESSAGE);
                repeat = false;
            }
        }
        try {
            socket.close();
            System.exit(0);
        }catch(IOException ex) {
            ex.printStackTrace();
        }
    }
}