School of Science
Further Programming COSC 2391/2401, S2, 2019
Casino Style Coin Game
Assignment Part 2: AWT/Swing UI Implementation
Assessment Type: Individual assignment; no group work. Submit online via Canvas→Assignments→Assignment 2. Marks are
awarded for meeting requirements as closely as possible according to section 2 and the supplied rubric.
Clarifications/updates may be made via announcements/relevant discussion forums.
Due date: Due 6:00PM Fri. 18th October 2019. Late submissions are handled as per usual RMIT regulations – 10% deduction
(2.5 marks) per day. You are only allowed to have 5 late days maximum unless special consideration has been granted.
Weighting: 25 marks (25% of your final semester grade)
This assignment requires you to build an AWT/Swing graphical user interface for the Coin Game that reuses your code from
assignment part 1.
You should build on top of your existing assignment part 1 functionality and should not need to change your existing Game Engine
code if it was correct in assignment part 1. You can seek help in the tutelab/consultation to finish assignment part 1 if necessary
(since it is a core requirement of this course that you should be able to work with basic OO classes and interfaces). Furthermore, you
will require a solid understanding of classes/interfaces to write effective AWT/Swing!
2. Assessment Criteria
This assessment will determine your ability to implement Object-Oriented Java code according to a written and visual specification
and incorporating specific design patterns. In addition to functional correctness (i.e. getting your code to work) you will also be
assessed on code quality. Specifically:
You should use MVC implementation for your system.
You should write all your listeners as separate controller classes in the controller package.
You must not use any static referencing (e.g. no use of the Singleton pattern permitted).
You should aim to provide high cohesion and low coupling as covered in this course.
You should aim for maximum encapsulation and information hiding.
You should rigorously avoid code duplication.
You should comment important sections of your code remembering that clear and readily comprehensible code is preferable
to a comment.
Since this course is concerned with OO design you should avoid the use of Java 8+ lambdas which are a functional
You should emphasize basic usability of the UI (based on the usability attributes described in the lecture notes).
You should use extra threads where necessary (based on the sample code provided in this document) to ensure smooth UI
operation that is correct according to the Java API specification.
3. Learning Outcomes
This assessment is relevant to the following Learning Outcomes:
CLO1: Explain the purpose of OO design and apply the following OO concepts in Java code: inheritance, polymorphism, abstract
classes, interfaces and generics.
CLO2: Describe and Document Diagrammatically the OO design of the Java Collection Framework (JCF) and apply this
framework in Java code.
CLO3: Describe and Document Diagrammatically the OO design of the Java AWT/Swing APIs and apply these APIs to create
graphical user interface (GUI) code.
CLO4: Demonstrate Proficiency using an integrated development environment such as Eclipse for project management, coding
CLO5: Describe and Document Diagrammatically common OO design patterns such as Model View Controller (MVC), Observer,
Decorator and apply in Java code.
4. Assessment details
As part of your new implementation you must write a GameEngineCallbackGUI class that is added to the GameEngine via
the existing addGameEngineCallback() method. This class will be responsible for managing all of the graphical updates as the
game is played. NOTE: this class should not actually implement the UI functionality but instead for cohesion it should call methods
on other classes, especially the view. To state another way, it must be the entry point for any UI code resulting from game play, in
order to avoid coupling between the GameEngine and the UI which is counter to the original specification.
This GameEngineCallbackGUI is to be added in addition to the console based GameEngineCallbackImpl from
assignment 1 in order to demonstrate that your GameEngine can work with multiple callbacks i.e. both (all) callbacks are called for
any relevant operation such as playerCoinUpate()/resultPlayer(). NOTE: This is the main reason the assignment part 1
specification required the GameEngineImpl to handle multiple callbacks! It should also help debugging since you will have the
console output to match against the UI behaviour.
AWT/Swing User Interface
You are to develop an AWT/Swing user interface that implements the following basic functionality:
Add players (including name and initial betting points balance) displaying an error message or dialog for invalid data
Place a bet (per player) including specifying the bet type and displaying an error message or dialog for invalid bets
Cancel/Remove a bet
Players spin (per player) .. both coins are shown in real-time in the CoinPanel as they are spun (using the supplied .png files .. see
details below) with independent timings
Spinner spins – Once all players have bet and spun the Spinner automatically spins and again their coins are displayed in real time in
Display updated player balances in the SummaryPanel after the spin has finished including stating WIN/LOSS per player and then
reset all bets to NO_BET
NOTE: You should set your delay parameters to (100, 1000, 100, 50, 500, 50) ms for testing and submission.
You have some flexibility with designing the layout and appearance of your interface and should focus on clarity and simplicity
rather than elaborate design. However, to demonstrate competency you should include at least one each of the following and must
also meet the specific requirements in the UI implementation section below.
A pull-down menu (like the standard File menu in Eclipse)
A dialog box
A status bar
A switchable per player CoinPanel showing the coin graphics as well as the animated and correctly timed coin spins (see UI
Implementation/Limitations below for more detail)
A SummaryPanel which is always visible which shows player names, their current points balance, their current bet (including bet
type) and their most recent win/loss calculated according to the betting odds from assignment 1.
A mechanism such as a button for initiating a spin (but the spin should also occur automatically once all players have placed a bet)
Marking emphasis will be on the quality of your code and your ability to implement the required functionality as well as basic
usability of the UI (based on the usability attributes described in the lecture notes).
Your code should be structured using the Model View Controller pattern (MVC) where the GameEngineImpl from assignment
part 1 serves as the model, the listeners represent the controllers as separate classes (each in a separate file placed in the
controller package), whereas the GameEngineCallbackImpl and new GameEngineCallbackGUI are part of a view
package (or sub-packages), as are any additional UI classes such as frames, dialogs, components, menus etc. Furthermore, you must
NOT use static referencing (e.g. no use of the Singleton pattern) and therefore all references required by different classes must be
passed as parameters (e.g. via constructors).
IMPORTANT: Your assignment 2 code should be a separate Eclipse project called CoinGameGUI which references assignment 1
via the Eclipse build path dialog. This provides clear separation and helps ensure all of your GUI code (MVC views including the
GameEngineCallbackGUI and controllers) is separate from your GameEngineImpl implementation (MVC model).
Furthermore, all of your GUI code should call your GameEngineImpl implementation via the GameEngine interface only. You
should not add any UI code to the GameEngineImpl with the primary test being that your UI code should work with any
GameEngine implementation (for example our own implementation we will use for testing). i.e. your UI should not require
anything additional from the assignment 1 GameEngineImpl if implemented correctly according to the Javadoc and assignment 1
specification. Finally, your GameEngineImpl should still pass the Validator checks from assignment 1. Another way to think about
it is that any changes to the original assignment 1 project should be to fix missing functionality, not to add anything new.
NOTE: It is a core learning outcome of this assignment to demonstrate that encapsulation and programming to OO interfaces
provides complete separation such that code written by independent parties can work together seamlessly without any change!
You must only display the CoinPanel for a single player at a time, whereby the visible/active player can be directly selected from a
list or combo box (for example a JComboBox in the toolbar).
More importantly, since the UI is per player, if a player is currently visible/selected and spinning, when you switch to another player
the UI should stop animating the spinning coins and should instead display the last coins spun by the player you switched to. You
can however assume that only one player will be spinning at a time so you do not have to handle concurrency in the Game Engine
but you should enforce this in the UI (for example by disabling the spin button during a spin).
The animation, positioning and scaling of the CoinPanel is likely the most challenging part of the assignment and should be left until
the end when everything else is implemented correctly. That said it just requires some basic arithmetic (scaling and coordinate
translation) and a bit of patience to get it right 🙂
Moreover, you can get the main functionality working first using a simple JLabel that is updated for each new intermediate result
(playerCoinUpate(…)/spinnerCoinUpdate(…)) received from the GameEngineCallback method. You can also
refer to the console logs.
Additionally, the supplied heads.png and tails.png (under img/ in the supplied Eclipse project) should be drawn square (i.e.
not rectangular) and scaled to be centered in the CoinPanel. When there is room to display them left to right they should fill the
height of their container but if there is not enough room due to resizing to a taller aspect ratio you should pad at the top and
I have provided a video CoinFlip(100,1000,100,50,500,50)delay.mp4 on Canvas using my own sample
implementation for reference so you can see the exact required resizing and spinning behaviour of the coins rather than me
providing a long-winded description! NOTE: This video only shows the spin but not include the SummaryPanel and other
functionality described above which must also be implemented.
To simplify doing the animation you can redraw the background on every update and redraw the coins in their new position.
The SummaryPanel should only take up one quarter, to a maximum one third, of the frame with the CoinPanel taking the
remainder of the space (excluding any toolbars, status bars etc. which should be compact). Resizing should be appropriately handled
using layout management.
Although threads will be covered towards the end of the semester, AWT/Swing requires all calls to the UI (any methods in
AWT/Swing such as creating a component, laying out, or updating) to be done on the AWT Event Dispatch Thread. Furthermore,
since the spinPlayer()/spinSpinner() methods of GameEngineImpl executes in a loop with a delay (or using Timer) it
is necessary to run it in a separate thread so it does not lock up the UI.
To achieve this you can use the code below. You don’t need to know exactly how this works for now (although the API docs are
useful here and we will also cover in class) but hopefully you are able to identify how the code is simply using anonymous inner
classes to execute some code on a separate thread!
To call a GameEngineImpl method (such as spinPlayer()/spinSpinner()) on a separate thread.
public void run()
// call long running GameEngine methods on separate thread
To update the GUI from the callback ..
public void run()
// do GUI update on UI thread
IMPORTANT: As with assignment one you must not change any of the interfaces but you may implement any other helper classes
that you need to. A correct implementation should not require any changes to the GameEngineImpl, only the addition of new
AWT/Swing classes to build the UI, in addition to a new GameEngineCallbackGUI.
To demonstrate cohesion and correct OO techniques, all UI code must be written carefully by hand. You can use builder tools (such
as NetBeans) to aid prototyping but all final code must be written by hand since this is a programming not a UI design course 🙂 i.e.
You will lose marks if you submit generated code! You will also be breaching the “no third-party code” requirement below.
GAME RULES SUMMARY
A player cannot spin if they have not placed a bet
A player cannot bet more than their current points balance
If a player reaches 0 points you can automatically remove them from the game
Another player cannot spin during a spin but you can switch players to see their last spun coins
The Spinner automatically spins when all players with active bets have spun and you can also make this happen by cancelling bets
rather than spinning players for all bets
After the Spinner spins and the SummaryPanel is updated all bets are reset to NO_BET
5. Referencing and third party code exclusion
You are free to refer to textbooks and notes, and discuss the design issues (and associated general solutions) with your fellow
students or on Canvas; however, the assignment should be your OWN INDIVIDUAL WORK and is NOT a group assignment.
You may also use other references, but since you will only be assessed on your own work you should NOT use any third-party
packages or code, or any generated code (e.g. UI builders) (i.e. not written by you) in your work.
6. Submission format
The source code for this assignment (i.e. complete compiled Eclipse projects1
i.e BOTH assignment 1 and 2 projects) should be
submitted as a SINGLE .zip file by the due date using the Eclipse option export->general->archive.
IMPORTANT: SUBMISSIONS OF A COIN GAME OR TWO-UP GAME OR ANY OTHER GAME WHICH DO NOT IN ANY WAY ADHERE TO
THE SPECIFICATION AND PROVIDED CODE WILL RECEIVE A ZERO MARK
7. Academic integrity and plagiarism (standard RMIT warning)
NOTE: Any discussion of referencing below in the standard RMIT policy is generic and superseded by the third-party code exclusion in
Academic integrity is about honest presentation of your academic work. It means acknowledging the work of others while developing
your own insights, knowledge and ideas. You should take extreme care that you have:
Acknowledged words, data, diagrams, models, frameworks and/or ideas of others you have quoted (i.e. directly copied),
summarised, paraphrased, discussed or mentioned in your assessment through the appropriate referencing methods,
Provided a reference list of the publication details so your reader can locate the source if necessary. This includes material
taken from Internet sites.
If you do not acknowledge the sources of your material, you may be accused of plagiarism because you have passed off the work and
ideas of another person without appropriate referencing, as if they were your own.
RMIT University treats plagiarism as a very serious offence constituting misconduct. Plagiarism covers a variety of inappropriate
Failure to properly document a source
Copyright material from the internet or databases
Collusion between students
For further information on our policies and procedures, please refer to the University website.
8. Assessment declaration
When you submit work electronically, you agree to the assessment declaration.
1 You can develop your system using any IDE but will have to create an Eclipse project using your source code files for submission purposes.
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