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J2ME allows developers to use Java and the J2ME wireless toolkit to create applications and programs for wireless and mobile devices.
J2ME consists of two elements -- configurations and profiles.
Configurations provide a set of libraries and a virtual machine for a category of wireless device. There are two configurations for J2ME, one for fixed wireless devices and one for mobile wireless devices. Profiles are APIs built on top of configurations to provide a runtime environment for a specific device, such as a PDA, cellphone, or set-top box. The profile manages the application, user interface, networking and I/O.
This version of Java is mainly concentrated for the applications running on embedded systems, mobiles and small devices.(which was a constraint before it’s development)
Constraints included limited processing power, battery limitation, small display etc.
Also, the J2ME apps help in using web compression technologies, which in turn, reduce network usage, and hence cheap internet accessibility.
J2ME uses many libraries and API’s of J2SE, as well as, many of it’s own.
The basic aim of this edition was to work on mobiles, wireless devices, set top boxes etc.
Old Nokia phones, which used Symbian OS, used this technology.
Most of the apps, developed for the phones(prior to smartphones era), were built on J2ME platform only(the .jar apps on Nokia app store).
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