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The Basics of J2ME

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Sun created the Java 2 Micro Edition (J2ME) to allow development of Java applications for devices that do not have the same processing power and memory found on a typical desktop platform. This includes cellular phones, PDAs, pagers, entertainment and automotive navigation systems, to name a few. Read here to learn about J2ME's configurations, application programming interfaces, and device profiles.
This chapter is from the book

This chapter is from the book

Topics in this Chapter

  • Java Editions
  • Why J2ME?
  • Configurations
  • Profiles
  • Java Virtual Machines
  • Big Picture View of the Architecture
  • Compatibility between Java Editions
  • Putting all the Pieces Together

It all started with one version of Java—now known as Java 2 Standard Edition (J2SE)—and the tagline "Write Once, Run Anywhere ™." The idea was to develop a language in which you would write your code once, and then it would run on any platform supporting a Java Virtual Machine.

Since its launch in 1995, the landscape has changed significantly. Java has extended its reach far beyond desktop machines. Two years after the introduction of Java, a new edition was released, Java 2 Enterprise Edition, providing support for large-scale, enterprise-wide applications. The most recent addition to the family is the Micro Edition, targeting "information appliances," ranging from Internet-enabled TV set-top boxes to cellular phones.

Java Editions

Let's begin with a quick summary of the Java platforms currently available:

  • Standard Edition (J2SE): Designed to run on desktop and workstations computers.

  • Enterprise Edition (J2EE): With built-in support for Servlets, JSP, and XML, this edition is aimed at server-based applications.

  • Micro Edition (J2ME): Designed for devices with limited memory, display and processing power.

Figure 1–1 shows various Java editions.

NOTE

In December of 1998, Sun introduced the name "Java 2" (J2) to coincide with the release of Java 1.2. This new naming convention applies to all editions of Java, Standard Edition (J2SE), Enterprise Edition (J2EE), and Micro Edition (J2ME).

Figure 1–1 The various Java editions

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