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Assignment 1
The due date: 11:59pm, Friday, 6th of September 2019.
This assignment is worth 14% of the total course mark.
1. Objective
The purpose of this assignment is to make you familiar with the problems posed by
event-driven systems. As a supplementary task you also need to implement a simple
Graphical User Interface.
2. Specification
Exercise 1 Simple Reaction Controller
Imagine that you have been hired by an electronics company to build the software for
a simple Reaction-Timer game. The reaction timer has two inputs: a coin-slot that
starts the game and a go/stop button that controls it. There is also a display that
indicates to the player what he/she should do next. The machine behaves as follows.
• Initially, the display shows “Insert coin”, and the machine waits for a player to do so.
• When the player inserts a coin, the machine displays “Press GO!” and waits for the
player to do so.
• When the player presses the go/stop button, the machine displays “Wait...” for a
random time between 1.0 and 2.5 seconds. After the random delay expires, the
machine displays a time-value that increments every 10 milliseconds, starting at zero.
The player must now press the go/stop button as soon as possible – the goal of the
game is to show fast reactions! If the player presses the go/stop button during the
random delay period, i.e. the player tries to “guess” when the delay will expire, the
machine aborts the game and immediately demands another coin. To put it simply,
there is no reward for trying to cheat! If the user has not pressed stop after two
seconds, the machine will stop automatically – no living person could be that slow!
• Whether the player has pressed the go/stop button within the two seconds waiting
time period or not, the machine displays the final timer value for three seconds, then
the game is over until another coin is inserted. If the player presses the go/stop button
while the measured reaction time is being displayed, the machine immediately
displays “Insert coin”.
Exercise 2 Enhanced Reaction Controller
After showing the basic reaction timer machine to potential customers, the marketing
department has found that some of them would like to pay more for a deluxe reaction
timer that allows multiple games after payment of a single coin. In this machine, when
a coin is inserted, the player is allowed to play three games. The operating sequence
is very similar to the previous one: insert coin, press the go/stop button, wait random
delay, press the go/stop button, then display the time for three seconds. If the
machine has not yet completed three games, it then displays “Wait...”. Subsequently,
it waits a (new) random delay and proceeds further as in the first game. After
displaying the time for the last game, the machine shows the average time “Average=
t.tt” for five seconds, then the game is over. The enhanced reaction controller
should fulfil the following requirements.
• If after inserting the coin the player fails to press go/stop within ten seconds, the
game is over.
• If the player presses the go/stop button during the waiting period, the game is
aborted, and the average value is not displayed. Once again, no reward for cheating!
• If the player presses the go/stop button while the machine is displaying a reactiontime
value, the machine immediately moves on to the next game (or shows the
average time) without waiting for the full three seconds of display time.
• If the player presses the go/stop button while the machine is displaying the average
time, the game is immediately over.
3. Program Components
Your program must consist of the following parts.
• A controlling program named ReactionMachine is provided as a base to test your
• SimpleReactionController and EnhancedReactionController are the modules which
you need to realize. The both components must conform to the interface Controller.
This is the main body of the exercises. You are free to write these components in any
way you choose, so long as they implement the required interfaces. You must write
SimpleReactionController.java that functions like the simple reaction machine
described above and EnhancedReactionController.java that behaves like the
enhanced multi-game reaction machine.
• A Display is a GUI component which you need to write to test your reaction machine.
It must conform to the Gui interface. The GUI must have a button labelled “Coin
Inserted” and a button labelled “Go/Stop”. There must be a display region to show the
messages of the machine. Times must be displayed with two decimal places. For
example, a value of 1.5 seconds must be shown as 1.50. Do not go to too much effort
to make your GUI “beautiful”. We are more concerned here with correct operation of
your controllers rather than with your artistic ability! You must write Display.java that
implements the necessary GUI functions.
Important. To ensure that we can automatically test your program, you must comply
with the following constraints.
• Obviously, your program needs a source of timing information. You must obtain this
information by implementing the tick method in your controller. The ReactionMachine
class guarantees to call this method every 10 milliseconds. Do not use a Java timer, or
your program cannot be tested and will fail all the tests.
• Your program also needs a source of random numbers. You must obtain your
random numbers by calling the getRandom() method in the interface Random. Do not
use the Java Random class, or your program will fail all the tests.
4. JAVA Files Provided
We provide the following java files for you.
• Controller.java contains an interface specification. Both of your reaction controllers
must implement this interface.
• Gui.java contains an interface specification. Your GUI must implement this interface.
• Random.java contains an interface specification for the random number generator.
• ReactionMachine.java contains a simple driver program that will allow you to test
your reaction controllers.
Please, be aware that you cannot alter the interface files, or we will not be able to test
your program. Your display and two controllers must work correctly with
5. Running the Driver Program
You can run the driver program by typing: java ReactionMachine c, where c is the name
of the controller you want to test. For example, java Reactionmachine
SimpleReactionController will run the SimpleReactionController program. You are, of
course, free to modify this program or build another one to help you with your testing.
6. Submission instructions for programming code
First, type the following command, all on one line (replacing aXXXXXXX with your
svn mkdir --parents -m "EDC"
Then, check out this directory and add your files:
svn co https://versioncontrol.adelaide.edu.au/svn/aXXXXXXX/2019/s2/edc/assignment1
cd assignment1
svn add SimpleReactionController.java
svn add EnhancedReactionController.java
svn add Display.java
svn commit -m "assignment1 solution"
Next, go to the web submission system at:
Navigate to 2019, Semester 2, Adelaide, Event Driven Computing, then Assignment 1.
Click Make a New Submission for This Assignment and indicate that you agree to the
declaration. The script will then check whether your code compiles. You can make as
many resubmissions as you like.

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