1. Java 2 Swing
B.Ramamurthy
5/1/2019
B.Ramamurthy

2. Topics for Discussion Review Abstract Window Toolkit JDK1.2 Additions
Java Foundation classes
Collection classes
Swing Package
Swing Demo
Summary
5/1/2019
B.Ramamurthy

3. Review of AWT (partial list)
Component
CheckBox
Button
TextComponent
Container
MenuComponent
TextField
TextArea
Menu
MenuBar
MenuItem
Panel
Window
Applet
Frame
Dialog
5/1/2019
B.Ramamurthy

4. JDK1.2 Additions JFC java2D(3D) AWT Drag&Drop Swing Accessibility
(Speech, Sight API)
Collection classes
Bug fixes
JDK1.2 changes
5/1/2019
B.Ramamurthy

5. Swing package
Swing provides components for developing UI and event (user) driven applications. EX; menus, toolbars, etc.
Swing is a major enhancement of AWT.
Can AWT and Swing coexist? YES
How is Swing component different from an AWT component?
5/1/2019
B.Ramamurthy

6. Swing Component Two distinguishing characteristics are :
1. It supports pluggable Look and Feel. Besides run-anywhere, appearance of a component may be changed at run-time to look and feel like the system on which it is running.
2. Swing components are Lightweight components: they do not dependent on any native system classes.
5/1/2019
B.Ramamurthy

7. Speed Issue
When using java Speed is an important issue to be concerned with.
Right now Java is slow:
Suggestions for improvement in your environment:
1. Faster hardware
2. Speed up techniques: Speed up JVM, use JIT (just in Time compiler) to by pass JVM when ever acceptable.
3. Use lightweight components
5/1/2019
B.Ramamurthy

8. Software/Hardware Push/Pull
demand
Software
Hardware
supply
EX: 1000Mhz intel CPU
5/1/2019
B.Ramamurthy

9. Lightweight Components
Motivation for lightweight components is two-fold: run-anywhere, speedup
application
1. Lightweight
2. Normal
3. Bypass JVM; Use
Native code
( JIT)
Button 3 1 2
JVM
Operating System
5/1/2019
B.Ramamurthy

10. Swing Lineage java.lang.Object java.awt.Component java.awt.Container
java.Swing.JComponent
Note : This is my approach to studying a class/package.
Exploring the lineage should be the starting point
5/1/2019
B.Ramamurthy

11. Swing Components (controls)
JApplet
JButton
JCheckBox
JTable
JTextPane
JSlider
JTree
JPopupMenu
Jtooltip
JScrollBar
JScrollPane
JDialog
JMenuBar
etc.
Note : J prefix to distinguish it from regular AWT components.
5/1/2019
B.Ramamurthy

12. Swing Demo Lets see what it offers through a demo.
This is available in : jdk1.2/demo/jfc/SwingSet/SwingSetApplet.java
5/1/2019
B.Ramamurthy

13. Java Development Kit (JDK 1.2)
Supports development of applications in Java by providing packages of classes to accomplish various commonly used functions, their complete source code, documentation for the API (application programmer’s interface).
Tools : compiler (javac), runtime (java, appletviewer), documentation generator (javadoc)
5/1/2019
B.Ramamurthy

14. Javadoc
Parses declarations and documentation comments in a set of Java source files and produces a set of HTML pages describing the public and protected classes, interfaces, constructors, methods and fields.
Generates one .html file for each .java file and each package.
Also generates a class hierarchy (tree.html) and index files of the members (AllNames.html)
5/1/2019
B.Ramamurthy

15. Commenting the Source Code
All comments with the format given below and immediately before a class, interface, method or field is recognized and used by javadoc.
Format
/**
* This class is for running the show
* This is next line
* This is another line of comment */
5/1/2019
B.Ramamurthy

16. How to use Javadoc?
After your application is ready for deployment, run it through javadoc to generate the programmer’s manual :
javadoc {options} java source file names/package names
A complete hypertext version of programmer’s manual for your application will be ready in minutes.
5/1/2019
B.Ramamurthy

17. Browse through Javadoc generated documentation?
Javadoc generated documents usually start off at an index.html.
Use any html browser to open up this file associated with the application and follow the links.
5/1/2019
B.Ramamurthy

18. Summary Discussed salient features of Swing.
AWT and Swing components may co-exist.
Swing offers LookAndFeel of host environment and lightweight components.
Discussed use of Javadoc tool for preparing documentation for applications.
5/1/2019
B.Ramamurthy