Java by Example

1
Java by Example

• Introducing IDE, Eliza, UI, IO and other creatures

2
Developer Needs

• Why not use command-line and notepad?

3
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.

4
Borlands 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

5
JBuilders Hands-on
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Java toy example - Eliza

• Who is Eliza?
• Eliza was born in the early 1960s in MITs
  labs. It is viewed as the first intelligent
  machine. Its creator is Prof. Joseph Weizenbaum.
• ?????? ???? ????? ??? ????? ?????? ??????? IBM
  ????"? ????? ?? ?????. ????? ??? ?????? ????? ???
  ''????????? ????????? ??? ????? ????? ????????
  ?? ????'' .

7
Whats next?

• We will browse through a few of Javas 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
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The MVC pattern
Meet Little SmallTalk in OOP

• 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

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UI in Eliza
JPanel
JTextArea
JLabel
JScrollPane
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
ElizaUI
ltltElizaModelInterfacegtgt
implements
ElizaModel
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/tutor
  ial/uiswing/index.html
• Collections Trail - http//java.sun.com/docs/books
  /tutorial/collections/index.html
• Java 1.5 Tiger - http//java.sun.com/developer/t
  echnicalArticles/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