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COMP2396 Object-oriented programming and Java
Assignment 5: A two-player Tic-Tac-Toe Game
Due Date: 22th Dec 2019 23:59
This assignment tests your understanding on GUI, Java Socket Programming and the
application of multi-threading.
In this assignment, you are going to implement a two-player Tic-Tac-Toe Game. The
game would only start when the Tic-Tac-Toe Server runs and two players are connected
to the server. When the game starts, players need to input their player’s name first (i.e.
the player cannot make any move if he/she does not enter his/her player’s name) (Fig.
1). Players are not allowed to re-input their names again once they have submitted their
names (i.e. the textboxes and the submit buttons should be disabled). In addition, their
names should be displayed in the frame’s title (i.e. change from Tic Tac Toe to Tic Tac
Toe-Player: (player’s name)) and the message title (located below the menu bar) should
change from “Enter your player name…” to “WELCOME (player’s name)” (Fig. 2).
Initial setting:
Fig. 1
After player enters his/her name:
Fig. 2
After entering the player’s name, the game would always be started by player 1 (the
player’s mark with a “x”)’s first move (i.e. player 2 (the player’s mark with a “o”)
cannot make his/her first move until player 1 makes his/her first move). If player 1’s
move is valid, his/her move would be marked as a “x” on the 3 x 3 board (The mark “x”
on the 3 x 3 board should be displayed on both player 1’s and player 2’s board). The
message title in the player 1’s board would be changed to “Valid move, wait for your
opponent.” while the message title in the player 2’s board would be changed to “ Your
opponent has moved, now is your turn.”. Besides, player 1 is not allowed to make the
next move until his/her opponent moves (i.e. if player 1 makes the next move before
his/her opponent moves, it would be considered as an invalid move and nothing would
be displayed on the board). The turn would be switched to the opponent (this time player
2) and if player 2’s move is valid, it would be mark as a “o” on the 3 x 3 board on both
players. The message displayed in the message title of the player 2’s board would be
changed to “Valid move, wait for your opponent.” while the message title of the player
1’s board would be changed to “ Your opponent has moved, now is your turn.” Similarly,
the turn would be switched to player 1 again and player 2 cannot make his/her next
move until player 1 makes the move (Fig. 3 & 4).
Fig. 3
Fig. 4
Criteria for a valid move:
- The move is not occupied by any mark.
- The move is made in the player’s turn.
- The move is made within the 3 x 3 board.
The game would continue and switch among the opposite player until it reaches either
one of the following conditions:
- Player 1 wins.
- Player 2 wins.
- Draw.
The winning condition is that when there is any row, column or diagonal that is filled
with the same mark (e.g. player 1 would win if there is any row, column or diagonal
that is filled with “x”, player 2 would win if there is any row, column or diagonal that
is filled with “o”). The game will draw if no players satisfy the winning condition after
all the board location is filled with mark. Once it reaches either one of the above
conditions, Message Dialog would be displayed on both players (the content of the
Message Dialog would be different, based on the condition reached) and both players
cannot make further move. The following screen captures show the Message Dialog
displayed on the two players when either one of the player wins (Fig. 5 & 6) or the
game is draw (Fig. 7).
Fig. 5
Fig. 6
Fig. 7
In addition to the above, you also need to handle the case when one of the players left
during the game process. In this case, the game would terminate immediately (i.e. the
remaining player cannot make further move), a Message Dialog “Game Ends. One of
the players left.” would be displayed on the remaining player, as shown below in Fig.
8.
Fig. 8
Besides, as you can see in the screen captures, there is a JMenuBar which consists of 2
JMenu, named Control and Help (located above the message title). In the JMenu of
Control, it consists of a JMenuItem, named Exit while in the JMenu of Help, it consists
of a JMenuItem, named Instruction (Fig. 9 & 10). When the player clicks “Exit”, he/she
would exit from the game and the game would be terminated immediately. When the
player clicks “Instruction”, a Dialog Frame consists of some game information would
be displayed (Fig. 11).

Fig. 9 Fig. 10
Fig. 11
Important notes for the assignment:
1. In this assignment, you can assume both the server program and the client
programs run on local host (i.e. with IP address 127.0.0.1).
2. You can have your own design but you must include the GUI components as
shown in the above screen captures and all the functionalities described in this
document should be implemented. To ensure your program has implemented all
necessary functions, please refer to the marking scheme below as for your
references.
3. This assignment will be marked by features (Your code would not be
investigated). You are required to write JavaDoc for all non-private classes and
non-private class member functions. Programs without JavaDoc will lead to
mark deduction. However, you don’t need to generate JavaDoc htmls. Just write
comment blocks in your source program.
4. You are required to include a readme.txt file which clearly describes how
to start and run your program. If you do not include a readme.txt file to
describe how to start and run your program, your assignment will NOT be
marked. If following the instructions written in the readme.txt file still lead
to failure to start and run your program, your assignment will also NOT be
marked.
5. Please submit all files in a single compressed file (in .zip or .7z) to Moodle. Late
submission is NOT allowed. Do NOT submit .class files.
Marking Scheme:
Correct implementation of GUI
components:
- 1 JMenuBar which consists of 2
JMenu which each JMenu consists
of its corresponding JMenuItem
(5 marks)
- 1 message title (2 marks)
- 1 3 x 3 tic-tac-toe board (5 marks)
- 1 textbox for player’s entering
his/her name (2 marks)
- 1 submit button for submitting the
player’s name (2 marks)
Total 16 marks
Correct functionality of the game:
- Implementation of restricting players
to make their move before they
submit their names (5 marks)
- Implementation of restricting players
to enter and submit their names
more than ONCE (5 marks)
- Implementation of updating the
frame title after players submit their
names (5 marks)
- Implementation of correct message
title after players submit their names
and make a valid move (5 marks
each, total 10 marks)
- Implementation of correct switching
between players after a player makes
a valid move (5 marks)
- Implementation of the game is
started by Player 1’s move (5 marks)
- Implementation of display player’s
mark on the board (for both players)
when one of the players makes a
Total 74 marks
valid move (5 marks)
- Implementation of NOT display
player’s mark on the board (for both
players) if the player makes an
invalid move (5 marks)
- Implementation of the 3 conditions:
Player 1 wins, Player 2 wins and
Draw (5 marks each, total 15 marks)
- Implementation of the case when
one of the players left during the
game process (5 marks)
- Implementation of the functionality
of Help (5 marks)
- Implementation of the functionality
of Exit (4 marks)
JavaDoc Total 10 marks

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