If your cellphone already supports WML or another markup language
Tutorial Details:
The first advantage is that Java is a proper programming language, in the procedural/object-oriented sense, and is used on a wide variety of platforms. WML is a declarative language, to which you graft some procedural logic using WMLScript, and is used only on cellphones. Java is more suited for complicated programming tasks.
The second advantage is that Java lets you work offline. With a Java-enabled cellphone it's possible to download and install an application that you can then run without incurring connection charges, something you can't really do when you're browsing websites with the phone's microbrowser. You can even run applications when you're out of coverage, something that may be foreign to Europeans but something that we North Americans -- with our vast geographical areas and competing, incompatible networks -- have to deal with on a regular basis.
Of course, you can work offline to a degree with WML by using cached decks, but only if the decks are designed to be cached. And you really don't have much control over what gets cached, since it's all under the control of the browser and the deck creator.
One of the problems with Java is that the runtime system -- the Java interpreter, the native code that interfaces to the operating system, and the Java runtime library -- is quite large. When I say "large", I mean several megabytes, clearly too much for small computing devices like today's cellphones. And that's where Java 2 Micro Edition (J2ME) comes in. Instead of merely trimming fat from the Java 2 Standard Edition (J2SE), J2ME is a complete rewrite of the Java runtime with the specific memory and processing power restraints of small devices in mind.
Central to J2ME are the concepts of configurations and profiles. A configuration defines the basic features of a Java runtime system: what the virtual machine must do, how much memory is required, and the core set of runtime classes (ideally a subset of ones in J2SE). A profile builds on top of a configuration (and even on top of other profiles) by adding classes geared for a specific family of devices or specific kinds of applications.
Read
Tutorial at: Click here to view the tutorial
Rate Tutorial: The Mobile Developer
View Tutorial: The Mobile Developer
Related
Tutorials:
 JavaWorld Developer
Tools Table
JavaWorld Developer
Tools Table
|
Program Java devices -- An
overview - JavaWorld July 1999
Program Java devices -- An
overview - JavaWorld July 1999
|
Solve real problems with aglets, a type of
mobile agent - JavaWorld May 1997
Solve real problems with aglets, a type of
mobile agent - JavaWorld May 1997
|
Program your Palm in Java, Part 1: The PalmOS
Emulator - JavaWorld November
1999
Program your Palm in Java, Part 1: The PalmOS
Emulator - JavaWorld November
1999
|
JavaWorld Developer
Tools Guide: IDE
JavaWorld Developer
Tools Guide: IDE
|
JavaWorld Developer
Tools Guide: Testing Tools
JavaWorld Developer
Tools Guide: Testing Tools
|
JavaWorld Developer
Tools Guide
JavaWorld Developer
Tools Guide
|
Program your Palm in Java, Part 1: The PalmOS
Emulator - JavaWorld November
1999
Program your Palm in Java, Part 1: The PalmOS
Emulator - JavaWorld November
1999
|
Unleash mobile agents
using Jini
Unleash mobile agents
using Jini
|
Best tools for
mobile application development
Best tools for
mobile application development
|
J2ME devices:
Real-world performance
J2ME devices:
Real-world performance
|
Let the mobile
games begin, Part 2
Let the mobile
games begin, Part 2
|
High-availability mobile applications
High-availability mobile applications
|
Develop state-of-the-art mobile
games
Develop state-of-the-art mobile
games
|
Getting Started With the Mobile 3D Graphics API for J2ME
This tutorial introduces the Mobile 3D Graphics API for J2ME, JSR 184. The article presents an overview, potential application areas, the differences between JSR 184 and two related APIs, the classes in the new optional package, the programming model, the
|
WAP Toolkits Motorola - Mobile ADK 1.1 Nokia - WAP Toolkit
WAP Toolkits Motorola - Mobile ADK 1.1 Nokia - WAP Toolkit
Tutorial
WAP Toolkits
T o develop any WAP application you have to download software essential for development. Although you can write and test your codes through our site for learning
|
NetBeans IDE 4.1
Out-of-the-box support for J2EE 1.4 and Web Services. Check out what early access release 2 can do for you!
|
Chat Transcript: Solving the Device Fragmentation Problem
Read the questions that your fellow developers had about the new feature in NetBeans Mobility Pack 4.0 that helps solve device fragmentation problems, and the answers straight from the engineers who created the module.
|
Comparing J2ME Multimedia Options
This article presents the latest developments in MMAPI: the new security considerations raised in MMAPI 1.1, the differences between MMAPI and the MIDP 2.0 Media API, J2ME Wireless Toolkit 2.2 support for MMAPI, and JSR 234, Advanced Multimedia Supplement
|
Easy Emulation With New NetBeans Mobility Pack 4.0
With the click of a button, switch back and forth between different emulation environments while developing one set of code. It's never been this easy to take advantage of Java technology's cross-platform capabilities.
|
|
|
|
