J2Me Introduction; The Java 2 Platform, Micro Edition (J2Me) - Motorola V3x Technical Manual

2

J2ME Introduction

The V3x includes the Java™ 2 Platform, Micro Edition, also known as the J2ME platform.
The J2ME platform enables developers to easily create a variety of Java applications
ranging from business applications to games. Prior to its inclusion, services or
applications residing on small consumer devices like cell phones could not be upgraded
or added to without significant effort. By implementing the J2ME platform on devices like
the V3x, service providers, as well as customers, can easily add and remove applications
allowing for quick and easy personalization of each device. This chapter of the guide
presents a quick overview of the J2ME environment and the tools that can be used to
develop applications for the V3x.

The Java 2 Platform, Micro Edition (J2ME)

The J2ME platform is a new, very small application environment. It is a framework for the
deployment and use of Java technology in small devices such as cell phones and pagers.
It includes a set of APIs and a virtual machine that is designed in a modular fashion
allowing for scalability among a wide range of devices.
The J2ME architecture contains three layers consisting of the Java Virtual Machine, a
Configuration Layer, and a Profile Layer. The Virtual Machine (VM) supports the
Configuration Layer by providing an interface to the host operating system. Above the VM
is the Configuration Layer, which can be thought of as the lowest common denominator of
the Java Platform available across devices of the same "horizontal market." Built upon this
Configuration Layer is the Profile Layer, typically encompassing the presentation layer of
the Java Platform.
15