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Java Platform, Micro Edition - Wikipedia, the free encyclopedia. Java Platform, Micro Edition, or Java ME, is a Java platform designed for embedded systems (such as mobile devices, for example).
Target devices range from industrial controls to mobile phones (especially feature phones) and set- top boxes. Java ME was formerly known as Java 2 Platform, Micro Edition (J2. ME). Java ME was designed by Sun Microsystems, acquired by Oracle Corporation in 2. Originally developed under the Java Community Process as JSR 6. Java ME have evolved in separate JSRs. Sun provides a reference implementation of the specification, but has tended not to provide free binary implementations of its Java ME runtime environment for mobile devices, rather relying on third parties to provide their own.
As of 2. 2 December 2. Java ME source code is licensed under the GNU General Public License, and is released under the project name phone. ME. As of 2. 00. 8, all Java ME platforms are currently restricted to JRE 1. Should Oracle ever declare a new round of Java ME configuration versions that support the later class file formats and language features, such as those corresponding to JRE 1. JREs. The most common of these are the Mobile Information Device Profile aimed at mobile devices, such as cell phones, and the Personal Profile aimed at consumer products and embedded devices like set- top boxes and PDAs.
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Profiles are subsets of configurations, of which there are currently two: the Connected Limited Device Configuration (CLDC) and the Connected Device Configuration (CDC). It was also used on the Bada operating system and on Symbian OS along with native software. Users of Windows CE, Windows Mobile, Maemo, Mee. Go and Android can download Java ME for their respective environments. CLDC is basically used for classifying myriad devices into a fixed configuration.
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A configuration provides the most basic set of libraries and virtual- machine features that must be present in each implementation of a J2. ME environment. When coupled with one or more profiles, the Connected Limited Device Configuration gives developers a solid Java platform for creating applications for consumer and embedded devices. The configuration is designed for devices with 1. KB to 5. 12. KB total memory, which has a minimum of 1.
KB of ROM and 3. 2KB of RAM available for the Java platform. Mobile Information Device Profile. Applications written for this profile are called MIDlets.
Almost all new cell phones come with a MIDP implementation, and it is now the de facto standard for downloadable cell phone games. However, many cellphones can run only those MIDlets that have been approved by the carrier, especially in North America.
A key design goal of MIDP3 is backward compatibility with MIDP2 content. Information Module Profile. JSR- 2. 28, also known as IMP- NG, is IMP's next generation that is based on MIDP 2. MIDP 2. 0's new security and networking types and APIs, and other APIs such as Push. Registry and platform. Request(), but again it doesn't include UI APIs, nor the game API.
Connected Device Configuration. It is richer than CLDC. Foundation Profile.
This profile is intended to be used by devices requiring a complete implementation of the Java virtual machine up to and including the entire Java Platform, Standard Edition API. Typical implementations will use some subset of that API set depending on the additional profiles supported. This specification was developed under the Java Community Process. Personal Basis Profile. This is the platform that BD- J is built upon. Implementations. Starting with the Java. ME 3. 0 SDK, a Net.
Beans- based IDE will support them in a single IDE. In contrast to the numerous binary implementations of the Java Platform built by Sun for servers and workstations, Sun does not provide any binaries for the platforms of Java ME targets with the exception of an MIDP 1. JRE (JVM) for Palm OS. The latter company was purchased by Sun in April 2. Sun's Java. FX Mobile. The company IS2. T provides a Java ME virtual machine (Micro.
Jvm) for any RTOS and even with no RTOS (then qualified as baremetal). When baremetal, the virtual machine is the OS/RTOS: the device boots in Java. This is a Java Applet- based emulator and can be embedded in web pages. The open- source Mika VM aims to implement Java.
ME CDC/FP, but is not certified as such (certified implementations are required to charge royalties, which is impractical for an open- source project). Consequently, devices which use this implementation are not allowed to claim Java. ME CDC compatibility. The linux- based Android operating system uses a proprietary version of Java that is similar, but not identical to Java Me.
Especially cost effective Standards. Typical applications domains are industrial control, machine- to- machine, medical, e- metering, home automation, consumer, human- to- machine- interface, .. ESR #Name. Description. B- ON (Beyond CLDC)B- ON serves as a very robust foundation for implementing embedded Java software. It specifies a reliable initialization phase of the Java device, and 3 kind of objects: immutable, immortal and regular (mortal) objects.
Micro. UIMicro. UI defines an enhanced architecture to enable an open, third- party, application development environment for embedded HMI devices. Such devices typically have some form of display, some input sensors and potentially some sound rendering capabilities. This specification spans a potentially wide set of devices. MWTMWT defines three distinct roles: Widget Designers, Look and Feel Designers, and Application Designers. MWT allows a binary HMI application to run the same on all devices that provide a compliant MWT framework (embedded devices, cellphones, set- top box TV's, PC's, etc..) allowing for true consistency and ubiquity of applications across product lines (ME, SE, EE). ECLASSPATHECLASSPATH unifies CLDC, CDC, Foundation, SE, and EE execution environments with a set of around 3.
API. Compiling against CLDC1. ECLASSPATH makes binary code portable across all Java execution environments.