234321 Java by Example

Created by Ron Begleiter 1

Java by Example

Introducing IDE, Eliza, UI, IO and other creatures

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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 . בארה"ב לשוחח עם אליזהIBMלמעבדות

שיחות אלו 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 in a text field, or chooses a menu item

ActionListener

User closes a frame (main window) WindowListener

User presses a mouse button while the cursor is over a component

MouseListener

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

Swing architecture is rooted in the model-view-controller 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

Meet Little SmallTalk in OOP

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UI in Eliza

JLabel

JPanelJTextArea

JTextField

JScrollPane

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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

ElizaUI<<ElizaModelInterface>>

ElizaModel

implem

ents

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 conversationHi thereGreetings from inside the box.what shall we talk aboutDoes that question interest you?yesAre you sure?yes I amDo you enjoy being ?again yesYou seem quite positive.yesPlease elaborateI want to know what you would like to hearSo what's stop you?youWe were discussing you -- not me.damn rightSay, do you have any psychological problems?yesYou seem quite positive.yesWhy do you think so?because i find myself talking with computersDoesn't any other reasons come to mind?nopeCan you elaborate on that?I am spending my days in the Technion in the computers labDo you enjoy being spending my days in the technion in the computers lab ?no! Say again.noAre you sure?yesAre you sure?yesPlease elaborate