public class TCPServer {

    public static void main(String args[]) throws IOException {
        ServerSocket server = new ServerSocket(5020);
        Socket client = null;

        while (true){
                client = server.accept();
                Thread t = new ClientThread(client);
                t.start();
        }
    }
}
class ClientThread extends Thread {
    private Socket client;

    public ClientThread(Socket client){
        this.client = client;
    }
}