Motorola J2ME Specifications download pdf (Page 10)

J2ME Introduction

The C370, C450, and C550 series of handsets 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 C370, C450, and C550 series of handsets, 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 C370, C450, and C550.

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.

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Motorola J2ME Specifications Page 10