import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Scanner;

public class ClientClass {

    public static void main(String args[]) throws IOException, ClassNotFoundException
    {
        // take order and convert it to array of choices
        Scanner myScanner = new Scanner(System.in); // take from user
        System.out.println("Enter all your choices seperated by space:");
        System.out.println("Choices are: 1- 2- 3- 4");
        String orderString = myScanner.next();
        orderString += myScanner.nextLine();
        String orderArray[] = orderString.split(" ");

        // send request to server
        Socket mySocket = new Socket("127.0.0.1", 4444); // create a socket
        ObjectOutputStream out = new ObjectOutputStream(mySocket.getOutputStream());
        out.writeObject(orderArray);

        // get response from server
        Scanner MyScanner2 = new Scanner(mySocket.getInputStream()); // send the number to socket
        int temp = MyScanner2.nextInt();
        System.out.println(temp);

    }
}

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.PrintStream;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.channels.SocketChannel;
import java.util.Scanner;

public class ServerClass {

    public static void main(String args[]) throws IOException, ClassNotFoundException
    {
        // receive
        ServerSocket myServerSocket = new ServerSocket(4444); // create a server socket
        Socket mySimpleSocket = myServerSocket.accept(); // accept requests
        ObjectInputStream ois = new ObjectInputStream(mySimpleSocket.getInputStream());
        String[] choices = (String[]) ois.readObject();


        // send back response - how ???
        PrintStream myPrintStream = new PrintStream(mySimpleSocket.getOutputStream());
        myPrintStream.println(choices.length);

    }
}