CS242 Advanced Programming Concepts in Java

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CS242Advanced Programming Concepts in Java

• 9/20/07
• Intro to Swing

Prof. Searleman jets_at_clarkson.edu
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Announcements

• Career Fair!
• Greg Lacey from IBM will talk on software
  development Thurs., 400, SC162
• Also check out Johnson Johnson, PAR, GE, and
  many more
• Demetrios Dimatos will talk to our class today
  about his experience as a Java developer at IBM
  Silicon Valley

a horrible death to die
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Outline

• Graphical User Interfaces (GUIs)
• Java Foundation Classes (JFC) Swing
• Read the SUN Tutorial
• Constructing a GUI with JFC/Swing
• (http//java.sun.com/docs/books/tutorial/uiswing/
  index.html)
• return and discuss HW1
• HW1 and HW2 can be resubmitted by next Tuesday
• HW3 will be posted today due next Thursday

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Common errors

• missing source file comment
• javadoc comments
• not in correct location (so wont appear)
• reveals implementation details
• doesnt describe the object being modelled
• use constants instead of hard-coding numbers
• misuse of a class variable
• public, private, package, protected misused
• initializes to a meaningless number (e.g. 0, -1)
• inadequate testing
• source file not in afs

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Whats the problem?
public class Die() Random rng public int
TopSide // other stuff
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Whats the problem?
public class Die() private static Random
rng private int topSide public Die()
rng new Random() topSide
rng.nextInt(5) 1 // other stuff
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Whats the problem?
public class Die() private static Random
rng private int topSide private final int
DefaultSIDES 6 public Die() rng
new Random() topSide rng.nextInt(DefaultS
IDES) 1 public int roll()
rng new Random() topSide
rng.nextInt(DefaultSIDES) 1 return
topSide
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How to resubmit an assignment

• Make a new subdirectory in your afs directory
  (e.g. hw1r)
• upload your new source files and test runs
• turn in BOTH the original printout with the grade
  sheet attached and the new printout

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JFC

• AWT (Abstract Window Toolkit)
• java.awt. and java.awt.event.
• Swing
• javax.swing. and javax.swing.event.
• Accessibility, 2D API, Drag Drop

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Swing

• consistent user experience across platforms
  (written in Java, peerless)
• pluggable look feel (PLAF)
• (Windows, Metal, Motif LFs builtin)
• Model-View-Controller (MVC) Framework

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Swing API

• javax.swing
• javax.swing.event
• other Swing packages include
• javax.accessibility, javax.swing.border
• javax.swing.colorchooser,
• javax.swing.filechooser, javax.swing.plaf
• javax.swing.table, javax.swing.text
• javax.swing.text.html, javax.swing.text.rtf
• javax.swing.tree, javax.swing.undo

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Lightweight Components

• AWT heavyweight components
• Frame --- peer with ? native window
• Button --- peer with ? native button
• Swing lightweight components
• components are not dependent on native peers to
  render themselves use simplified graphics
  primitives to paint themselves on the screen

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Model-View-Controller MVC Architecture

• Model The core of the application. This
  maintains the state and data that the application
  represents. When significant changes occur in the
  model, it updates all of its views
• Controller The user interface presented to the
  user to manipulate the application.
• View The user interface which displays
  information about the model to the user. Any
  object that needs information about the model
  needs to be a registered view with the model.

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Look Feel
Java LF (Metal)
GTK LF (Motif)
Mac OS LF
Windows LF