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J2ME PLATFORM

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ContentsIntroductionWhy J2ME?J2ME PlatformCPO (configuration, profile and optional packages)ApplicationsPros and consReferences

INTRODUCTION J2ME is a Java platform designed specifically for limited applications running on small devices such as mobile phones, PDAs, and so on. Java ME was designed by Sun Microsystems, acquired by Oracle Corporation in 2010; the platform replaced a similar technology “PersonalJava”.

WHY J2ME??

JAVA-”write once run anywhere” BUT:

•Different devices have different requirements.

•Those device doesn’t have same environment as regular computers.

•One platform cannot address all the market segments(web server, video

games etc).

•Users/developers wants flexibility.

•That’s why sun Microsystem decided to develop a special edition of Java-J2ME(Java 2 Micro Edition).

Cont…• The Java 2 Platform is split into three editions• java 2 standard Edition (J2SE) - Desktop-based applications.• Java2 Enterprise Edition (J2EE)- Server-based applications• Java 2 Micro Edition(J2ME)-For handheld and Embedded devices.

• Each edition provides a complete environment for running Java-based applications including the Java virtual machine (VM) and runtime classes.

• What separates one edition from another, then, is primarily the set of class libraries that each edition defines.

J2ME PLATFORM• At the heart of Java 2 Micro Edition (J2ME) are three core concepts: configurations, profiles, and optional packages.

•You can't write a J2ME application without understanding these concepts, because they determine the features of Java that you can use, which application programming interfaces (APIs) are available, and how your applications are packaged.

Cont…•Optional Package

•Profile• A collection of Java Classes selected from

one or more Java Core, extension or Vertical APIs. Classes are chosen to provide a COMPLETE solution for a specific vertical market.

•Configuration• A subset of java core APIs and Java

Language functionality selected to provide a minimal java platform for a set of vertical markets.

CPO•Configuration• A configuration is a complete Java runtime environment:

• Java virtual machine (VM) to execute Java. • Set of core Java runtime classes .• Interface to the underlying system.

•Profile• Adds classes to a configuration• Fill in missing functionality• Support specific uses of a device

•Optional Packages• Support additional and common Packages• Bluetooth Optional Package

ConfigurationThere are 2 basic configuration•CDC(Connected Device Configuration):• 2 MB or more memory for Java

platform.• 32-bit processor.• High bandwidth network connection.• full-featured Java 2 virtual machine

(CVM).• 17 packages. Use for devices like Palms.

•CLDC(Connected Limited Device Configuration):• 160-512 KB of total memory• 16-bit or 32-bit processor• Low Power Consumption • Limited Bandwidth• KVM without• Floating point types• Object finalization• JNI or reflection• User class loaders

This one we use

MIDP(Mobile Information Device Profile)

The CLDC-Profile used today:• The MIDP defines a platform for dynamically and securely

deploying optimized, graphical, networked applications.• The MIDP specification was defined through the java Community

Process(JCP) by players like:◦ Motorola◦ Nokia◦ Ericsson◦ Research in Motion◦ Symbian

Cont… There are two versions of the MIDP:

◦ MIDP 1.0◦ is the original specification, provides core application functionality

required by mobile applications. including basic user interface and network security .

◦MIDP 2.0◦ is a revised version of the MIDP 1.0. Have new features include an

enhanced user interface. multimedia and game functionality, more extensive connectivity, over-the-air provisioning, and end-to-end security .

MIDlet MIDP does not run in the "regular" Java fashion. using: Main() , System.exit().

Instead, we use MIDIet applications - which are subclasses of: javax.microedition.midlet.MIDIet that is defined by MIDP.

The MIDIet class allows the application management software to:◦ control the MIDIet ◦ be able to retrieve progenies from the application descriptor◦ notify and request state changes

JAR/JAD One or more MIDIets are packaged together into a MIDIet suite, composed of:

◦ JAR (Java archive) file :JAR file contains Java classes for each MIDIet in the suite and Java classes

that are shared between MIDIets. The JAR file also contains resource files used by the MIDlets and a manifest file.

◦ JAD (Java Application Descriptor) file :◦ This file contains a predefined set of attributes that allows the device

application management software to identify, retrieve, and install the MIDlets.

The JAD/JAR files are upload to the machine in order to run the application

ApplicationsOpera Mini (How can we forget)Mobile RSS ReaderWho wants to be a millionaire? 2010 by Glu mobile Dakar 2010 by EA mobile EA sports FIFA 2010 by EA mobileGaana

Pros and cons Pros

◦ Over-the-Air Downloading ◦ Network-aware Applications ◦ Wireless Boom

Cons◦ Standardization ◦ The Physical Restrictions of Mobile

Devices ◦ Fight over Market dominance and

monopoly problems◦ Development problems ◦ Absolute over other new mobile

technologies

References [1] Sun Microsoystems Inc. Java 2 platform, micro edition G2me),

http://java.sun.comlj2me/ ,200S. [2] Jafar Ajdari , Helsinki University of Technology , Java 2 Mobile

Information Device Profile (MIDP) www.tml.tkk.fi/Studies/Tik-111.590/2001s/papers/

[3] Xu JunWu; Liang JunLing ; “Develop Mobile Application with J2ME for 3G networks” 2010 Second International Workshop on Education Technology and Computer Science,Page(s):770-773

ANY QUESTION?