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Java for Mobile Devices is a set of technologies that let developers deliver applications and services to all types of mobile handsets, ranging from price efficient feature-phones to the latest smartphones.
Java Platform, Micro Edition (Java ME) provides a robust, flexible environment for applications running on embedded and mobile devices in the Internet of Things: micro-controllers, sensors, gateways, mobile phones, personal digital assistants (PDAs), TV set-top boxes, printers and more. Java ME includes flexible user interfaces, robust security, built-in network protocols, and support for networked and offline applications that can be downloaded dynamically. Applications based on Java ME are portable across many devices, yet leverage each device's native capabilities.
The Connected Limited Device Configuration and the Java ME APIs are used by a vast number of Java mobile phone developers, carriers, and OEMs to create feature phone products around the globe. Oracle is the leader in providing mobile phone technology found on over three billion devices and counting.
A State-of-the-Art toolset for developing embedded and mobile applications, the Oracle Java Micro Edition Software Development Kit provides a a standalone development environment and set of utilities for application development across the whole range of Java ME device targets in the Internet of Things.
The Oracle Java Micro Edition (ME) Embedded Client is an application runtime that builds on the popular Java ME specification and has been designed for resource-constrained devices like e-book readers, Blu-ray Disc players, Voice Over IP telephones, televisions, set-top boxes, printers, residential gateways and more. Java ME is the best technology for resource constrained embedded devices and has seen widespread deployment across mobile handsets and digital television devices. Java ME provides device manufacturers with the full power of the Java language, a comprehensive set of APIs, industry-leading security and access to more developers than any other platform. Through its compatibility with the Java Platform Standard Edition (Java SE), the Oracle Java Micro Edition Embedded Client inherits familiar Java features and benefits from a rich development ecosystem that enables Java developers to hit the ground running. An extensive range of tools, such as the NetBeans IDE, provides sophisticated power for creating and debugging applications. At the same time, the Oracle Java Micro Edition Embedded Client capitalizes on its Java ME heritage by being specially designed for speed and efficiency on devices with limited processing power and memory.
A MIDlet suite is a combination of a JAR file that collects the MIDlets and the associated files necessary to create the Java ME Embedded application, and a Java Application Descriptor (JAD) file that identifies the application to target devices. A MIDlet suite can be built, executed, and deployed to mobile devices.
For the Java ME platform, the Micro Edition Embedded Profile (MEEP) defines a standard set of Java APIs that, together with the Connected Limited Device Configuration (CLDC), provides a complete Java ME application runtime environment targeted at mobile information devices, such as cellular phones and wireless personal organizers.
The Java Application Descriptor File (.jad) contains header information for a MIDlet suite, such as the company that developed the application, application name, and size. When an application is downloaded to a device, the descriptor is downloaded and read before the JAR file that contains the Java ME Embedded application. This enables the device to confirm that space exists for the application, and confirms that the full application should be downloaded.
An emulator simulates how your application will operate on a specific type of mobile device such as standard and touch screen mobile phones. Emulator platforms include specific device examples, or skins, that simulate the operations of a specific device.
Support for Over-The-Air (OTA) download testing. This support simulates the complete lifecycle of an application, starting from the Over-The-Air (OTA) Provisioning from a web site, installing and verifying, running, updating, and removing your application without involving an external web server.
A JavaTM 2, Micro Edition platform (Java METM Platform), Mobile Edition Embedded Profile (MEEP) application is an application targeted for mobile devices such as mobile phones, PDAs, and two-way pagers. Such applications conform to both the Connected, Limited Device Configuration (CLDC) and MEEP.
In the IDE, MIDlet Suites are managed as Java ME Embedded projects. Java ME Embedded projects are executed through an emulator platform, which simulates the execution of the application on a specific mobile device. Using project configurations and preprocessor code blocks, you can define conditions for multiple devices in a single set of code, enabling you test and produce MIDlet suites for each device.
Compile with Optimization. If checked, the compiled application is optimized for execution. This is the -O option in javac. Optimizing can slow down compilation, produce larger class files, and make the program difficult to debug.
Performance and security are primary concerns for any application. Because the Java language was designed to be compiled into a platform-independent bytecode format, much of the information contained in the source code remains in the bytecode, making it easy to decompile or reverse-engineer a Java application. This format can also contribute to larger file sizes, and with the limited resources of mobile devices, every byte saved in a Java ME Embedded application counts towards mobility and performance.
One of the most difficult aspects of developing applications for mobile devices is device fragmentation. The situation arises when vendor-specific, proprietary, or optional APIs are added to mobile devices to expand device functionality. Mobile devices often differ in a variety of attributes, such as screen size or color depth, and many support proprietary or optional APIs. These differences can require special code or project settings. To solve this problem, the IDE supports project configurations.
A project configuration defines the execution environment for a Java ME Embedded application that emulates a specific mobile device. You can define multiple project configurations for an application, then customize the properties of each configuration to match the specific devices for which you are programming. This enables you to test and debug your application for each device. You can then use project configurations to deploy a separate distribution JAR for one or all of your configurations.
The Platform project properties pane enables you to choose an emulator platform that simulates a mobile device to which the application will be deployed. The properties shown are specific to the active project configuration, shown in the Project Configuration drop down menu of the dialog.
You can also choose to execute the MIDlet using Over-the-Air provisioning which is the process of deploying an application from a website on to a mobile device. If you choose Execute Through OTA in the Java ME Embedded Project Run Property sheet, the IDE simulates the OTA process so you can test and demonstrate the full provisioning process of the MIDlet suites from the server to a device. Additional information on OTA Application Provisioning is available at -156355.html.
The Platform project properties panel enables you to choose an emulator platform that simulates a mobile device to which the application will be deployed. The properties shown are specific to the active project configuration, shown in the Configuration drop down menu of the Platform panel.
The Java Micro Edition SDK is a collection of tools and device emulators that support the development of Java applications that run on devices compliant with the Micro Edition Embedded Profile (MEEP) and Connected Limited Device Configuration (CLDC). These include a wide range of mobile phones, embedded systems, Blu-ray consoles and other devices.
Java Platform, Micro Edition or Java ME is a computing platform for development and deployment of portable code for embedded and mobile devices (micro-controllers, sensors, gateways, mobile phones, personal digital assistants, TV set-top boxes, printers). Java ME was formerly known as Java 2 Platform, Micro Edition or J2ME. As of December 22, 2006, the Java ME source code is licensed under the GNU General Public License, and is released under the project name phoneME.
Java ME devices implement a profile. 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. Profiles are subsets of configurations, of which there are currently two: the Connected Limited Device Configuration (CLDC) and the Connected Device Configuration (CDC).
There are more than 2.1 billion Java ME enabled mobile phones and PDAs.[when?] It was popular in sub-$200 devices such as Nokia's Series 40. It was also used on the Bada operating system and on Symbian OS along with native software. Users of Windows CE, Windows Mobile, Maemo, MeeGo and Android can download Java ME for their respective environments ("proof-of-concept" for Android).
Designed for mobile phones, the Mobile Information Device Profile includes a GUI, and a data storage API, and MIDP 2.0 includes a basic 2D gaming API. 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.
Most mobile applications use the Java Micro Edition (Java ME) platform, which was developed for small devices like mobile phones, but is now used on a wide variety of devices. Java ME uses scaled down subsets of Java SE components, virtual machines and APIs. It also defines APIs that are specifically targeted at consumer mobile and embedded devices. NetBeans IDE supports Oracle Java ME Embedded and Java Card platform. 2b1af7f3a8