Java by Example
Introducing IDE, Eliza, UI, IO and
other creatures
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Created by Ron Begleiter
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Developer Needs
Why not use
command-line and
notepad?
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integrated development
environment
integrated development environment (IDE)
is an application or set of tools that allows
a programmer to write, compile, edit, and
in some cases test and debug within an
integrated, interactive environment.
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Borland’s JBuilder
• Availability: Free (Foundation version)
• Functionality: integrated editor,
debugger, compiler, visual designers,
wizards, refactorings, code formatting, and
much more.
• Supported OS: Windows, Linux, Unix and
Mac
• Other Java IDEs: Eclipse, IntelliJ
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JBuilder’s Hands-on
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Java toy example - Eliza
Who is Eliza?
Eliza was “born” in the early 1960s in MIT’s
labs. It is viewed as the first intelligent
machine. Its creator is Prof. Joseph
Weizenbaum.
‫המשורר דויד אבידן נסע בשנות השבעים למעבדות‬
‫ שיחות אלו‬.‫ בארה"ב לשוחח עם אליזה‬IBM
:‫פורסמו בספרו בשם ''הפסיכיאטר האלקטרוני שלי‬
.'' ‫שמונה שיחות אותנטיות עם מחשב‬
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What’s next?
• We will browse through a few of Java’s
basic capabilities and demonstrate how
we used them in the toy example;
• We will focus on the collection framework,
In\Out processing and User Interfacing
(UI).
• Finally, we will raise a few questions.
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Java Collection Framework
Interfaces:
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Java Collection Framework
Implementations:
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Collections in Eliza
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Java IO
Character Streams - Reader
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Java IO
Character Streams - Writer
PrintWriter
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Java IO
Byte Streams - Input
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Java IO
Byte Streams - Output
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Java IO in Eliza
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Java UI - swings
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Swing (continued)
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Swing (continued)
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Swing (continued)
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Swing (continued)
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Swing (continued)
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Event Listener
Some Events and Their Associated Event Listeners
Act that Results in the Event
Listener Type
User clicks a button, presses Enter while typing
ActionListener
in a text field, or chooses a menu item
User closes a frame (main window)
WindowListener
User presses a mouse button while the cursor is
MouseListener
over a component
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User moves the mouse over a component
MouseMotionListener
Component becomes visible
ComponentListener
Component gets the keyboard focus
FocusListener
Table or list selection changes
ListSelectionListener
Any property in a component changes such as
the text on a label
PropertyChangeListener
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The MVC pattern
Meet Little
SmallTalk
in OOP
Swing architecture is rooted in the model-viewcontroller design that dates back to SmallTalk.
MVC architecture calls for a visual application to
be broken up into three separate parts:
– A Model that represents the data
for the application.
– The view that is a visualization of
that data
– The controller that manipulates the view and
updates the model
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UI in Eliza
JPanel
JTextArea
JScrollPane
JLabel
JTextField
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UI in Eliza (code 1/3)
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UI in Eliza (code 2/3)
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UI in Eliza (code 3/3)
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MVC in Eliza
<<ElizaModelInterface>>
ElizaUI
implements
ElizaModel
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Where is the controller?
Why use an interface?
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Questions
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Questions (continued)
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Links
• Java tutorial –
http://java.sun.com/docs/books/tutorial/
• Swing Trail http://java.sun.com/docs/books/tutorial/uiswing/index.html
• Collections Trail http://java.sun.com/docs/books/tutorial/collections/index.html
• Java 1.5 ‘Tiger’ http://java.sun.com/developer/technicalArticles/Interviews/hamilton_qa.html
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Eliza – sample conversation
Hi there
Greetings from inside the box.
what shall we talk about
Does that question interest you?
yes
Are you sure?
yes I am
Do you enjoy being ?
again yes
You seem quite positive.
yes
Please elaborate
I want to know what you would like to hear
So what's stop you?
you
We were discussing you -- not me.
damn right
Say, do you have any psychological problems?
yes
You seem quite positive.
yes
Why do you think so?
because i find myself talking with computers
Doesn't any other reasons come to mind?
nope
Can you elaborate on that?
I am spending my days in the Technion in the computers lab
Do you enjoy being spending my days in the technion in the computers lab ?
no!
Say again.
no
Are you sure?
yes
Are you sure?
yes
Please elaborate
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