Multiplayer Java Game via Sockets. Where two Players could play this game on different computers.

1. Multiplayer Java Stream-Socket
Game
By : KARIM BAIDAR

2. Objective
The objective is to create a Multiplayer game
where two distinct users can play that game
from two distinct computers.

3. How It is Operated
CLIENT
CLIENT
SERVER
PLAYER ‘O’
PLAYER ‘X’

4. Stream Sockets ?
• With stream sockets, a process establishes a
connection to another process
• Stream sockets are said to provide a
connection-oriented service
• The protocol used for transmission is the
popular TCP (Transmission Control Protocol)

5. Class Framework of Game
• Box-listener Class ( Listens to user click Events
on the surface board)
• Box Class (Implements each of the nine
square boxes on the surface board)
• Client Class (Maintains its own GUI version)

6. Class Framework Cont..
• Player Class(Enable the clients to play the
game independently)
• Server Class(The server maintains the
information about the Surface Board and
Clients)

7. Implementation of Server
• Via server we establish a connection using
ServerSocket()
• The server maintains the information about
the surface board so it can determine whether
a player’s move is a valid or invalid move.

8. Implementation of Server Cont..
• The game main logic is placed in Server class
• Server class is the Main Class
• Server waits for connection to connect two
clients

9. ServerSocket
• ServerSocket(Port Number , Clients);
• Implements a socket that servers can use to
listen for and accept connections to clients
• A ServerSocket object establishes the port
where a server waits for connections from
clients.

10. ServerSocket Cont..
• The server assigns X to the first client to
connect and O to second respectively
• The second argument to the ServerSocket
constructor specifies the number of clients
that can wait for a connection and be
processed by the server.

11. ServerSocket Cont..
• It performs some operation based on that
request
• Returns a result to the requester after
processing

12. Implementation of Client
• Sockets are initialized in Client as below
– Socket connection = new Socket( server Address, port );
– Gets the socket's input and output stream and opens
readers and writers on them.
• Player X and Player O used in the game are
both clients

13. Implementation of Client Cont..
• Each client applet maintains its own GUI version of
the surface board on which it displays the state of
the game
• The clients can place a mark only in an empty square
on the board

14. Implementation of Players
• Runs a thread to handle Multi Players
• Gets the socket's input and output stream and opens readers
and writers on them.
• Show messages from both Players X and O
perspectives.

15. ServerSocket Client Server

16. Why we used Sockets in the Game ?
• A socket is one endpoint of a two-way
communication link between two programs
running on the network
• Stream-based connections are managed with
Socket objects.
• A Socket object connects a client to a server
by specifying the server name and port
number when creating the Socket object..

17. Note
• Code and complete package is given.
• Contact me at karimbaidar@yahoo.com