Java with OO Review
This
page is for students enrolled in the Spring 2008 Java
Programming Language Raytheon in-house course.
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16 July - Music Player project has
been updated, it's looking pretty cool if I dare say
so. Bugs are all fixed, several features
added, including an animated graphic.
10 July - I've added a MusicPlayer project that is a mp3
and wav file player. We'll switch over
to this project, and using NetBeans 6.1, focus on it
for the rest of the class. The player is
still a bit buggy, but does manage to do quite a bit correctly, using the same
third party mp3 player from javazoom that I used in
the Shapes project. And I changed the
homework assignments around.
25 June - Shapes has been updated to
include some of the next homework assignment.
The version posted will play mp3 files and prints the start, stop, and
elapsed times. I've also brought up the
project in NetBeans 6.1.
15 June - I've altered the homework
assignments somewhat, giving us more flexibility. See below.
Any statement or impression I may have given implying that you can't do
graphics with BlueJ is incorrect - there's just no
graphics editor to make it particularly easy to do it. The latest version of Eclipse does not
include a graphics editor as you may be used to with an IDE like Visual Studio
or Lab Windows/CVI. There is an Eclipse
GUI editor, but it runs on the older "Callisto"
release (3.2) of Eclipse rather than on the current "Europa"
release. So I am having some second
thoughts about using Eclipse exclusively - there's a nice version of NetBeans that's tailored for use with BlueJ
- you can concurrently work on the same project from both BlueJ and the
NetBeans IDE. You can enable the more
advanced features of the NetBeans IDE as you're ready for them - by default,
the NetBeans BlueJ edition
has some of NetBeans' more advanced features disabled
so as to present a simpler user interface.
We'll talk about this in class, but right now NetBeans
is looking a bit more attractive to me than Eclipse. The latest NetBeans
version, 6.1, includes an integrated GUI editor, UML diagramming, profiling,
etc. In the "IDE" wars, NetBeans seems to have forged ahead of
Eclipse for the time being.
I've uploaded the Shapes project
with the music file select popup incorporated.
Right now I have it so it will select and play .wav files only, but Sun
has available a media framework (Java Media Framework 2.1.1e) that includes an
mp3 player, or you can use some classes from
javazoom. I've added info below in the
homework section that will help you do this assignment.
12 June - Well, I have Shapes
cleaned up a bit more - I incorporated the changes suggested by one of our
students (Jim) to eliminate the casts I was doing in Test - Bjarne
is right - most casts are an indication of a design error. And I fixed up Kite - I eliminated the
constructor that used diagonals only (infinite set of kites that satisfy a
given set of diagonals - duh) and now have it properly implemented along with
scaleable interface. I did kludge up a ShowScalables function in Test to print Scalable
collections.
11 June - Tweaked Shapes
a bit to refactor functions. A student has identified an implementation
that avoids the casts I was using in the Collections, I'll incorporate that
fix.
4 June - I've put up the Shapes
project with the Homework 3 solution implemented. I do have an improper solution for the
Scaleable interface for the Trapezoid class at this point - I'll catch up to
this (probably when I finally manage to do a meaningful Polygon class :-).
28 May - I've uploaded a Shapes jar
file with Ellipse and Polygon classes.
The Polygon class is pretty weak, I'll add more to it later and put it
up on the site.
21 May - I just noticed that Sun is
willing to certify you as a Java developer if you give them some money and go
to an exam center and take a multiple choice test. Passing is 68% ?! This is just not very hard folks - you should
be able to pass the "Sun Certified Java Associate" after taking this
class (if you've done the homework and paid attention during class). Check it out. You
should be able to take and pass the "Sun Certified
Java Programmer"
certification with some work. You can
give Sun a little less money and take practice exams. The closest examination center is in
I tweaked the Shapes project some
more. Nothing major, but you may have to
rework your solutions a bit.
14 May - I've modified the Shapes
project to better define the abstract class Triangle, and I've changed the
notation used to something more conventional.
Look at the comment in the Triangle class to see the notation. I've added statements to the main method of
Test to create and use triangles of the three types. When you're ready to try out your
implementation, uncomment these statements to check your work. If you're having trouble remembering your
geometry, you might look here and maybe here too.
Yup, those movable triangles you see at the second link are Java
applets. And as a final clue (I am
getting soft in my old age) I'd use these constructors:
public EquilateralTriangle
(double dSideabc) { … }
public ScaleneTriangle (double dSidea,
double dSideb, double dAngleC)
{ … }
public IsocelesTriangle (double dSideac,
double dAngleB) { … }
Goals:
To review Object Orientation
fundamentals. To learn the Java
Programming Language.
Class Schedule:
Twelve one-hour meetings, Wednesdays
at noon starting 7 May 2008. Building B1, Room S827. (Computer training room on
North side of the building). Each hour attended counts towards training time.
Roll is taken (via a sign-in sheet) at every class, and your attendance is
recorded in the training database.
Text:
Core
Java, Volume 1 - Fundamentals, 8th Edition. Cay S. Horstmann
and Gary Cornell. ISBN 978- 0132354769
The book is provided to students at
no cost by the company. There are
countless books on Java, available at any bookstore with a computer
section. This particular book is
something of a classic, having been around since the early days of Java, and
it's been updated to keep track of new developments. The book describes the use of the Java
Developer's Kit (JDK) and the Eclipse IDE, but is not referent to BlueJ (see below).
Other popular Java books include:
The O'Reilly books:
Java Generics and
Collections. Maurice Naftalin
and Philip Wadler, ISBN 0596527756
Hardcore Java. Robert
Simmons. ISBN 0596005393
Eclipse IDE Pocket Guide. Ed Burnette.
ISBN
0596100655
Java in a Nutshell, 5th
Edition. David Flanagan, ISBN 0596007736
And:
Core Java, Volume II: Advanced
Features, Cay
Horstmann, Gary Cornel, ISBN 978-013235479
Core J2EE Patterns: Best
Practices and Design Strategies, 2nd Edition. ISBN 0131422464
Java Puzzlers: Traps,
Pitfalls, and Corner Cases, Joshua Bloch, Neal Gafter. ISBN 032133678X
Objects First with Java, A
Practical Introduction using BlueJ, 3rd Edition. David Barnes & Michael Kölling.
ISBN 0-13-197-629X
Thinking in
Java, 4th Edition, Bruce Eckel. ISBN
0-13-187248-6. You can download a PDF
copy of the 3rd edition for free here.
Robert G. (Bob) Hayes, Senior
Principal Software Engineer, Raytheon Vision Systems. Bob has been designing
software systems at Hughes Aircraft/Raytheon for 35 years. He holds a BSE in Electrical Engineering and
an MS in Computer Science.
This course is for
experienced programmers who want to learn how to write useful Java
applications. A basic understanding of
object orientation is a plus: the course
will start with two sessions of review of Object Orientation.
Other:
The only way to really
learn/understand a programming language is to write code, a lot of it. Expect
to do exercises in class and on your own.
Working together on exercises is allowed and expected.
BlueJ:
A nice, clean Java
environment for learning the language is the BlueJ IDE
(Integrated Development Environment) offered for free from www.bluej.org. Developed by European
academics, BlueJ runs on top of the Java JDK (Java
Developer's Kit) which can be obtained, again for free, from Sun's Java website
http://java.sun.com. BlueJ allows the
student to quickly start creating classes and running programs, in a more
benign environment than that offered by the Java SDK. BlueJ uses a UML
(Unified Modeling Language) class diagram to create class hierarchies, and can
do some other very cool things, such as:
- Create an instance of a class with a
simple key-click.
- Automatically create Java skeleton code
for a class.
- Execute methods without having to create
public static void main().
- Automatically create interface
documentation in HTML using javadoc.
- Simple text editor and debugger.
- Migration path to NetBeans
IDE with special BlueJ version of NetBeans
This
is a very cool tool, especially when you consider that it's free.
Eclipse:
Eclipse
is a free, open, full-featured Java IDE developed initially by IBM and now
governed by a not-for-profit group.
Eclipse has become the IDE of choice for many Java developers, and we'll
use it during the class.
Java at
Raytheon:
What is likely the largest software
development underway at Raytheon?
Raytheon is systems integrator for the new DDG 1000 destroyer - and
they're using Java! The Real Time Specification for Java (RTSJ), to be exact. Read about it here.
Here's an article about Java's
movement into the embedded domain,
including military systems such as those we design and create at Raytheon.
In a quick search on the Raytheon internal
job-opening site, RayCats, I found 20 open reqs asking for C# experience. I found 141 asking for Java! And almost all of them ask for an
understanding of UML.
Here are some useful links. There is
an immense amount of useful information on OO and on Java available on the web.
http://java.sun.com Sun's
Java site. Everything Java. You can download the SDK and NetBeans here, also Java tutorials.
http://www.bluej.org A nice (but limited) development environment for learning OO
using Java. It's free.
http://www.netbeans.org Despite the innocuous URL, this is Sun's
IDE. Current version 6.1 maybe the best
free IDE available.
http://www.eclipse.org A popular free Java
IDE, and
one we'll use in this class, though we'll start with BlueJ.
http://www.cetus-links.org Cetus. 18,000+
links on all things OO. This page hasn't
been maintained for quite a while now.
http://www.cs.lmu.edu/~ray/notes/introjava Professor Ray Toal's
Intro to Java page.
http://www.cs.lmu.edu/~ray Ray's
site. Lots of good things on these pages, Ray has
been LMU's Teacher of the Year. Notice all of the cool papers Ray and I have
co-authored :-)
A detailed C# Vs. Java comparison
Java Vs.
C# - a code for code comparison
MathOpenRef So you can figure out the geometry.
We'll generally follow the following
outline, though we may diverge from it or even omit certain topics
altogether. We'll do programming
exercises throughout the class.
·
Object Orientation Review (two class
meetings)
·
The Object Model
·
Classes and Objects
·
Java
·
History of Java
·
Key features/getting past the hype
·
Fundamental Programming Structures
·
Objects and Classes
·
Inheritance
·
Interfaces and Inner Classes
·
Java and the Web - Java WebStart
·
The Java
Virtual Machine
·
Generics
and Collections
·
Java ME
and Java EE
·
Java IDE's - Eclipse, NetBeans, and BlueJ
·
The Real
Time Specification for Java
·
C# Vs.
Java
1. Read chapters 1 (Introduction), 2
(Programming Environment), and 4 (Objects and Classes) of the text. I also recommend starting the Java tutorials on the
Java homepage.
2. Download and install JDK 6 (Java Developer's Kit) to a computer you
can use for programming. I recommend
downloading JDK 6 update 6. The beta version is, well, a beta version,
and the other versions include other stuff you don't need right now. You need the JDK, not just the JRE (Java
Runtime Environment). After you install
the JDK, you can test your JRE installation here. If
you're installing to a Raytheon computer, be sure to follow the company policy
for installing licensed software.
3. Download and install the BlueJ IDE.
Do this only after you've successfully installed the JDK.
4. Download the Shapes
project, and run it to verify that everything's set up properly. The project is in the form of a JAR (Java
Archive) file, and can be loaded directly into BlueJ. I may tweak this project from time to time,
so periodically check to see if it's been updated.
5.
Enhance
the Shapes project to complete the Triangle subclasses. You will need to alter only the three
Triangle subclasses - do not alter any others, including the Triangle
class. Provide a default constructor for
each Triangle subclass. Use one of the
Shape subclasses I've implemented to get an idea of what is needed. I've added code to the Test class to use the
Triangle subclasses, you can uncomment these statements to check your
work.
Homework
2:
1. Read chapters 3 (Fundamental Programming) and
5 (Inheritance)of the text. Continue following the Java tutorials.
2.
Refactor
the class hierarchy in Shapes to include either a Polygon class or an Ellipse
class. Should the Ellipse class be a superclass of Circle, or the other way around? Make any simplifying assumptions or
approximations you care to if you implement Ellipse, and feel free to redefine
Circle if that helps. Assume a regular
polygon too, that will help. Where in
the class hierarchy should you insert the Polygon class? Why?
Make sure all of the existing subclasses work as originally designed
after you add the Polygon or Ellipse classes.
Was it easier to implement the concrete Triangle subclasses in Homework
1, or the classes in this homework? Why?
Homework
3:
1. Read chapters 6 (Interfaces and Inner
Classes), 12 (Generic Programming), and 13 (Collections) of the text.
2. Add an Interface Scaleable to the Shapes project.
Scaleable contains a single
method,
void
Scale (double dScaleFactor);
which rescales a Shape using dScaleFactor in some sensible way, you decide how.
3. Add code to the Shapes Test class main() to
create, fill, and print a sorted collection of Shapes as a TreeSet.
4. Add code to the Shapes Test class main() to
create, fill, and print a sorted collection of Shapes as a PriorityQueue.
5.
Add code
to the Shapes Test class main() to create, fill, and print a sorted collection
of Shapes as a TreeMap. Use the perimeter of the shapes as the
key.
Homework
4:
1. Enhance the Shapes project to provide a popup
window at program start that allows you to pick a music clip (.wav file) from
the file system. You can do this with BlueJ. A hint - use
the JFileChooser class to do most of the work - my
implementation is about 15 lines of code (well, maybe 40 if you include the
file filter). There's a Sun tutorial
available on using this class. You may
find that trying to play a large wav file (greater than 20 MB or so) causes the
debug JVM in BlueJ to run out of heap space. You can increase the maximum heap space for
the debug JVM by adding the -Xmx<size>
option to the JVM arguments in the bluej\lib\bluej.defs file.
Find and change the bluj.vm.args
property to bluej.vm.args = -server
-Xincgc
-Xmx512m using WordPad or
similar text editor. I used a maximum
heap size setting of 512m (512 MB), this value must be
a multiple of 1024 bytes.
2. Add a class Kite to the Shapes project. See the MathOpenRef
web pages for info on a kite.
3. Download and install the Eclipse IDE onto your
computer. Alternatively, download and
install NetBeans (Sun's full featured IDE) and load
up Shapes into it. There's a BlueJ Edition of NetBeans
that is set up to easily accommodate BlueJ projects,
or you may choose the latest NetBeans
version 6.1.
4. Move the Shapes project from BlueJ to Eclipse or some version of NetBeans,
and rebuild and run it.
Homework
5:
1. Read chapters 7 (Graphics Programming), 8
(Event Handling), and 9 (Swing) of the text.
2. Enhance the Shapes project to present a frame
that displays the various shapes created in Test.main
(). This isn't very hard - BlueJ
comes with a Shapes demo that does circles, triangles, and squares, so you can
at least do these. The more ambitious of
you will try rectangles, parallelograms, trapezoids, and rhomboids. And I'll really be impressed with anyone
implementing ellipse. Make reasonable
assumptions about the allowed size of the objects.
3. Instrument the Shapes main method to log the
start and stop times and the elapsed time of execution.
4. Enhance the Shapes project to play mp3 files
on a background thread. You can use the JLayer classes from javazoom.
Homework
6:
1. Read chapters 10 (Deployment) and 11
(Exceptions, Logging, Assertions, and Debugging) of the text.
2. Enhance the MusicPlayer project to present a window with an animated
graphic of some kind that moves while the music is playing.
3. Enhance the MusicPlayer
project to allow the selection of multiple files for playback, and play them in
sequence or in random (shuffled) order, and to loop on the play list.
Homework
7:
1. Read chapter 14 (Multithreading) of the text.
2.
Prepare
three different UML diagrams (of your choosing) for the MusicPlayer
project. NetBeans
will of course generate a complete class diagram for you automatically, so you
really only have to figure out how to do two others.
See
how many of these you can define.
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Inheritance |
Polymorphism |
Generic |
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Inner
class |
Abstract
Class |
Concrete
Class |
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Map |
Interface |
Collection |
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Thread |
Lock |
Virtual
Machine |
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Priority |
Green
Threads |
Native
Threads |
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Template |
Big
Numbers |
Static |
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Scope |
Visibility |
Extent |
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Dynamic
binding |
Static
binding |
Cast |
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Protected |
Public |
private |
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Signature |
Variadic method |
Clone |
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Reference
variable |
Event |
Exception |
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Frame |
Callback |
Reflection |
|
Listener |
Adapter
class |
Swing |
|
AWT |
Layout |
JAR |
|
Sandbox |
Assertion |
Finally |
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Tree |
Hash
set |
Runnable |
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Daemon
thread |
Race
condition |
Synchronized |
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Monitor |
Thread
pool |
Semaphore |
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Thread-safe |
Deadlock |
Fatal
embrace |
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Enumeration |
Queue |
Deque |
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Supertype |
Applet |
Object
wrapper |
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Final |
Constructor |
Superclass |
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Subclass |
Factory
method |
Main
method |
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Overloading |
Package |
Class
path |
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Package
scope |
Object |
Class |
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Object
variable |
Class
variable |
Method |
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Field |
Mutator method |
Accessor method |
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String |
Immutable |
Enumerated
type |
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destructor |
OOP |
Native
method |
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Stream |
File |
framework |
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JVM |
JDK |
Proxies |
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Class
library |
Java
Beans |
Concurrency |
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Autobox |
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Last
Revised: 11 July 2008
Copyright Ó 2008 Robert G. Hayes.
e-mail the webmaster: javaclass@earthlink.net
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