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J2ME

J2me

J2me stands for java 2 platform, mobile edition. It is the platform that targets users/customers of electronics and embedded systems. These may include cellphones and other mobile embedded devices like set top boxes.

J2ME is a new and very small Java application environment.

It is a framework for the deployment and use of java technology in the post-PC world. J2me technology provides tailored run time environment for customer and embedded electronics by the help of a virtual machine and a set of APIs.

Java ME devices implements the concept of configuration and profile.

Configuration consists of a virtual machine, classes, APIs, core libraries. It caters for a generalized runtime environment for consumer electronic and embedded devices and acts as the Java platform on the device.

There are 2 J2ME Configurations:

• Connected Limited Device Configuration (CLDC)
• Connected Device Configuration (CDC)

CLDC(Connected Limited Device Configuration)

The CLDC provides a virtual machine and basic class libraries to support Java language applications on consumer products and embedded system devices such as communicators, mobiles, and interactive, digital television set-top boxes.

CLDC is designed for devices that have limited memory resources. Generally these devices have less than 512 KB of memory for java applications and platform and run on 16 or 32 bit CPU. For storage for the actual virtual machine and libraries, a minimum of 128KB out of 160 KB is required for it.

CLDC runs on top of the K virtual machine.

CLDC is responsible for the following issues

• Input/output
• Internalization
• Networking
• Core Java Libraries
• Security
• Java language and virtual machine features

CDC(Connected Device Configuration)

• CDC on the other hand is designed to cater for the next generation devices with more robust resources. Generally, CDC devices have 2 MB or more memory, which is available for performing java application on the java platform on a 32 bit CPU
• A CLDC-compliant profile is compatible with CDC but not vice- versa so is a superset of CLDC, CDC runs on top of C Virtual Machine (CVM) unlike CLDC which runs on top of K virtual machine.

It has 3 types of profile:

Foundation Profile

This profile is used by devices, which require complete implementation of the Java virtual machine and entire Java Platform, Standard Edition API. It uses some subset of that API set depending on other profiles supported.

Personal Basis Profile

The Personal Basis Profile includes a light weight Graphic User Interface by AWT subset.

Personal Profile

It has a more comprehensive AWT subset and adds applet support.