1 / 23

Developing an Application with J2ME Technology

Developing an Application with J2ME Technology. Scott Palmer, Nat Panchee, Judy Sullivan, Karen Thabet, Sten Westgard. Java - “One size does not fit all”. Java Technology - Editions. Memory footprint decreases. J2ME - Characteristics. J2ME maintains qualities of Java Technology

early
Download Presentation

Developing an Application with J2ME Technology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Developing an Application with J2ME Technology Scott Palmer, Nat Panchee, Judy Sullivan, Karen Thabet, Sten Westgard

  2. Java -“One size does not fit all”

  3. Java Technology - Editions Memory footprint decreases

  4. J2ME - Characteristics • J2ME maintains qualities of Java Technology • Consistency across products • Portability of code

  5. J2ME - Characteristics • Run anywhere, anytime and on any device • Safe network delivery • Upward scalability with J2SE and J2EE technology • OOP base language

  6. What is a Configuration? • Specifies Java Programming language features supported • Specifies the JVM features supported • Specifies the basic Java libraries and APIs supported

  7. J2ME Configurations • Connected Device Configuration (CDC) • Connected Limited Device Configuration (CLDC) • Purpose: • CDC – High end consumer devices • CDLC – Low end consumer devices

  8. Java2 Micro Edition - Architecture

  9. CDC • 32 bit processor • >.5MB (ROM+RAM) • JVM support • High bandwidth network connectivity • Devices include: • Communicators • Next Generation Smart Phones • Home Appliances • Car Navigation Systems

  10. CLDC • 16-32 bit processor • >160-512kB (ROM+RAM) • KVM support • Limited power/battery, network, GUI, Java class libraries • Devices include: • Cell phones • Personal Digital Assistants • Pagers

  11. America Online Bull Ericsson Fujitsu Matsushita Mitsubishi Motorola Nokia NTT DoCoMo Oracle Palm Computing RIM Samsung Sharp Siemens Sony SunMicrosystems Symbian CLDC Expert Group

  12. CLDC Packages • CLDC packages: • java.lang • java.io • java.util • javax.microedition.io

  13. CLDC • CLDC limitations: • No Floating-point Support • No Finalization • Error Handling Limitations • Limited Internationalization Support

  14. MIDP – Mobile Information Device Profile MIDP + CLDC = Part of J2ME Runtime Environment MIDP addresses: • User Interface • Persistent storage • Networking • Application model

  15. MIDP Packages MIDP Packages: • javax.micoredition.io • javax.microedition.midlet • javax.microedition.lcdui • javax.microedition.rms

  16. What is a MIDlet? • MIDP Application = MIDlet • MIDlet is similar to applet. • MIDlet Structure: • startApp() • pauseApp() • destroyApp(boolean unconditional)

  17. Paused pauseApp( ) startApp( ) Active destroyApp( ) destroyApp( ) Destroyed MIDlet’s Life Cycle

  18. Hello Midlet import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class HelloMidlet extends MIDlet { private Display display; TextBox box = null; public HelloMidlet() { } public void startApp() { display = display.getDisplay(this); box = new TextBox("Midlet Example", "Hello CS616", 20, 0); display.setCurrent(box); } public void pauseApp() { } public void destroyApp(boolean unconditional) { } }

  19. Hello Midlet

  20. J2ME Wireless Toolkit

  21. Developer Opportunities • Mobile Internet services • Value added services • Business to business apps

  22. A Wireless “Safe Home”

  23. Java Enabled Device Future “In 2002, Nokia will deliver more than 50 million Java enable phones; more than 100 million deliveries by end of 2003.” Pekka Ala-Pietila, Nokia President, JavaOne, 2001

More Related