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Java Intro

Java Intro. Chris North cs3724: HCI. Presentations. john randal, tom shultz Vote: UI Hall of Fame/Shame?. Quiz. Visualization design principles: show me the data Increase info density Overview first, zoom&filter, details on demand … How to map data to graphics?

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Java Intro

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  1. Java Intro Chris North cs3724: HCI

  2. Presentations • john randal, • tom shultz • Vote: UI Hall of Fame/Shame?

  3. Quiz • Visualization design principles: • show me the data • Increase info density • Overview first, zoom&filter, details on demand • … • How to map data to graphics? • 1. Data items become marks • 2. Data values map to mark attributes

  4. More Quiz • Multi-dimensional data? • multiple attributes • Types of scale in multi-dim data? • # points • # attributes • ranges of data values • 3 multi-dim visualizations? • par coords • Spotfire: mapping, brush&link, DQ • Tablelens: graphical table

  5. Data Scale • # of attributes (dimensionality) • # of items • # of possible values (e.g. bits/value)

  6. Spotfire • Multiple views: brushing and linking • Dynamic Queries • Details window

  7. TableLens (Eureka by Inxight) • Visual encoding of cell values, sorting • Details expand within context

  8. Parallel Coordinates (XmdvTool)

  9. Par coords: 10-100 attrs, <1000 points • Tablelens: 10-100 attrs, 1000, more by grouping • Spotfire: 10 attrs, more w/ DQ, 100,000 pts

  10. Homework #2: Info. Vis. Tools • Get some data: • Tabular, >=5 attributes (columns), >=500 items (rows) • Use 2 visualization tools + Excel: • Spotfire, TableLens, Parallel Coordinates • Mcbryde 104c • 2 page report: • Discoveries in data • Comparison of tools • Due: • Feb 19: A-K • Feb 21: L-Z

  11. Technologies • VisualBasic • Fast prototyping • Help stinks • Lack of control, multi-threading, POWER! • Code tends to be ugly, variation, arbitrary • Java • Power • Lots to learn • Slow development, except jbuilder? • Complexity • Tons of code • Help is good

  12. Java materials • Java 2 = sdk 1.2 or better • http://java.sun.com/j2se/ • Documentation: • http://java.sun.com/docs/ • Tutorials, reference, API • Sams “Teach yourself Java2 in 21 days” • Borland JBuilder 6 • http://www.borland.com/jbuilder/personal/ • Free! Cross between VB and VC++

  13. Java differences • Basic statements identical to C++ • Object-oriented only! • No .h files • Garbage collection: no delete • No pointers (object references only) • GUI: AWT, Swing • Applet/application • Single inheritance, interfaces • Packaging • No global vars • Error Handling, exceptions (try, catch) • E.g. Array bounds checking • Security • Objects, components

  14. Java compiling • Code: • myclass.java (text file) • Compile: • javac myclass.java • Creates: myclass.class (byte code) • Run: • java myclass • Java virtual machine, interpets/compiles (machine code) • Packaging: jar • Or use JBuilder, like VC++

  15. Java Applications • Run from command line, like .exe • HelloWorldApp.java: Class helloWorld { public static void main(String[] args){ system.out.println(“Hello World!”); } } • javac HelloWorldApp.java • Java HelloWorldApp Hello World! • Can be main( ) in any/all classes

  16. Java Applets • Run in a web browser, like .ocx control • HelloWorldApplet.java: Import java.awt.* public Class helloWorld extends javax.swing.JApplet { public void init(){ setBackground(Color.white); } public void paint(Graphics g){ g.setColor(Color.black); g.drawString(“Hello World!”, 10,10); } } • javac HelloWorldApplet.java • appletviewer HelloWorldApplet Hello World!

  17. Java Applets • HelloWorldApplet.html: <html><body> <applet code=“HelloWorldApplet.class” height=100 width=200> Need java. </applet> </body></html> • Put .html and .class on website • Java plug-in Hello World!

  18. Applet Methods • init( ) - initialization • start( ) - resume processing (e.g. animations) • stop( ) - pause • destroy( ) - cleanup • paint( ) - redraw stuff (‘expose’ event)

  19. Applet Security • No read/write on client machine • Can’t execute programs on client machine • Communicate only with server • “Java applet window” Warning • Certificates

  20. JBuilder

  21. Upcoming Java Topics • GUIs: Swing, AWT, MVC • Event handling, listeners • Graphics • Animation, threads • Components, JavaBeans • Databases, JDBC

  22. Next • Midterm: feb 26, tues Presentations: proj1 design or UI critique • Next Tues: mohamed hassoun, aaron dalton • Next Thurs: nadine edwards, steve terhar

  23. Project 2: Java • Teams due today • Get started on design • 0: form teams of 3 (feb 14) • 1: design (feb 28) • 2: initial implementation (mid march) • 3: final implementation (early April)

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