static class ClientHandler implements Runnable {
        Scanner scn = new Scanner(System.in);
        public String name;
        final DataInputStream dis;
        final DataOutputStream dos;
        Socket s;
        boolean isloggedin;

        // constructor
        public ClientHandler(Socket s, String name, DataInputStream dis, DataOutputStream dos) {
            this.dis = dis;
            this.dos = dos;
            this.name = name;
            this.s = s;
            this.isloggedin = true;
        }

        @Override
        public void run() {
            received = "";
            while (true) {
                try {
                    while (!received.equals("exit")) {
                        received = dis.readUTF();
                        textArea.append(name + ":\n" + received + "\n");
                    }
                    if (received.equals("exit")) {
                        this.isloggedin = false;
                        this.s.close();
                        break;
                    }
                } catch (IOException e) {
                    // e.printStackTrace();
                }
            }
            try {
                this.dis.close();
                this.dos.close();
            } catch (IOException e) {
                // e.printStackTrace();
            }
        }
    }