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How create servers and clients with socket?
public class Server {

    public Event receive(int port) {

        Evento event = null;
        try {
            ServerSocket ss = new ServerSocket(port);

            Socket s = ss.accept();
            InputStream is = s.getInputStream();
            ObjectInputStream ois = new ObjectInputStream(is);

             evento = (Evento) ois.readObject();

            is.close();
            s.close();
            ss.close();

        }catch(Exception e){
            System.out.println(e);
        }

        return event;
    }
}


public class Client {
    public void send(Event event, int port) {
        try {
            Socket s = new Socket("localhost", 2002);
            OutputStream os = s.getOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(os);

            oos.writeObject(event);
            oos.close();
            os.close();
            s.close();

        } catch (Exception e) {
            System.out.println(e);
        }
    }
}