Transcript playing-games

Java case studies: game playing
A simple software development process
from specification, to design,
implementation, and test
DAAD project
“Joint Course on OOP using Java”
Humboldt University Berlin, University of Novi Sad, ‘Polytehnica’ University of Timisoara,
University of Plovdiv, University of Belgrade
Author: Dušan Tošić
Version: Sep. 21, 2006
Points of this development Java For
the lecturer
only
sample games
Create a simple game
by using Java
Point out the
significance of
requirements
in software
development
Demonstrate the
importance of
software
engineering
principles for simple
Java programs
development
Using Java API
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Course materials
For
the lecturer
only
 Lecture slides:
• about 20 slides
• takes 1 lecture hour
 Assignments:
• modify presented programs by adding new
requirements
• make new games using presented examples
• Starting from presented examples, make a program
that can be use in education.
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Goal: Develop the program-game:
“Memory test”
Task:
Develop a program, to test the memory of
the user!
Motive:
“Test the memory of some pupils.”
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First option
The Requirements are not specified on the
beginning.
A pupil: ’I made a good Pascal program, we
can use it!’
OK, we can try that program! (The same
kind of program, as an application, we can
easily make in Java!)
Text-based program:Pascal\MEM1.EXE
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Facts concerning software
development phases
This slide is
taken from K.
Bothe
Most errors of software systems result
from misunderstanding the problem to
be solved.
Software development consists only of a
small part of programming:
•
•
•
•
Requirements analysis: 20 %
Design: 15 %
Implementation: 20 %
Test: 45 %
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Learning goals
 The presented examples should stress out
the importance of requirements in the
process of software development.
 Before implementing, the next step should
be design of the application:
specify components and
relations between them.
Starting with the implementation too early
may lead to project’s failure.
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Development process of
“Memory test“
Requirements analysis
Design
Implementation and test
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1. Requirements analysis:
“Memory test”
Task:
Develop a program based on GUI to test memory
of the user. The user should have possibilities to
open 2 fields and see data there. If 2 fields with
same data are opened, the fields stay opened,
otherwise closed. The goal is to open all fields.
Questions?
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Open questions
What kind of program should be developed
(applet or application in Java)?
Whether use keyboard or mouse?
How the field should look like?
What kind of data should be put into fields?
How to measure the properties (capacity)
of memory?
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Requirements specification (1,2,3)
1. It is not so important; the applet is
acceptable.
2. The mouse should be use.
3. The table with fields can be designed in the
following way:
A field
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Requirements Specification (4,5)
4. For the beginning, the kind of data is
not so important (we can use: numbers,
letters, signes, ...)
5. The numbers of mouse-clicks can be use as the
measure.
The second option:
MarijaSegrt\PAMCENJE.HTML
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2. Requirements analysis:
”Memory test”
The first 3 requirements can stay.
Additional requirements:
Instead the numbers, some pictures can
be used as data in fields. For example,
something like these:
Some other measures could be use for
the capacity of memory. For example the
time spent.
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Some changes are made in design of table and
two new implementations are created.
The third option:
Ann\SEMINARSKI_JEZICI\index.html
SrdjanJeisel\memorija.html
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3. Requirements analysis:
“Memory test”
The previous requirements can be kept.
The game may be improved by introducing
the different levels.
As the measure, the number of tests can be
used (in fact, this measure is used in the
second option).
The fourth option:
Dusan Radojevic\Memory.html
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Development process of
“Memory test“
Requirements analysis
Design
Implementation and test
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Notes about design
SW architecture description languages:
UML- industry standard. So, the UML is
used in this process.
The finding of classes and relations
between them is the most important task.
(In our cases different classes are used in
different examples.)
Our task is not so complicated (it is a
simple student’s assignment!) Thus, the
structure of our program(s) should not be
complicated.
We will skip the details about design-phase.
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Development process of
“Memory test“
Requirements analysis
Design
Implementation and test
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Note about implementation
The different implementations are presented
here.
The programming language Java is used for
the GUI-implementation.
If requirements are well defined and design
phase is completed, the implementation phase
is simple.
The details related to the implementation will
be skipped. (The source code is available.)
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Testing
This is the most time consuming phase.
After the first version of programs, different
corrections are made.
On the beginning, the testing is made
without pictures. Later, the pictures are
included.
The most interesting cases are examined
but the errors are possible.
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Critics of the implementations
The on-line help is usually absent.
The applets are not scaleable.
Better structure of classes is necessary.
Program should be more secure (the
private variable should be used).
. . .
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