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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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