Connected Limited Device Configuration
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The Connected Limited Device Configuration (CLDC) is a framework for J2ME applications targeted at devices with very limited resources such as pagers and mobile phones.
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Typical requirements
16bit CPU, a total of 160KB memory available to the Java platform, as well as a limited connection to some kind of network.
Noteworthy limitations
- CLDC 1.0 did not support any form of floating point arithmetic. This limitation was removed in CLDC 1.1.
Profiles
Mobile Information Device Profile
Designed for cell phones, it boasts a LCD orientated GUI API, with MIDP 2.0 including a basic 2D gaming API. Applications written for this 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.
Information Module Profile (JSR 195)
The Information Module Profile is designed for Vending Machines, Network cards, routers, Telephone boxes and other systems with either simple or no display and some form of limited two way network access. Only APIs for application creation, storage, and network access are defined. These are a subset of the javax.microedition.io, rms and midlet packages in MIDP. Siemens Mobile and Nokia put forward this specification to the JCP.
General APIs
java.io
A streamlined version of the java.io package found in the standard edition for doing Input/Output operations.
java.lang
Contains classes thought applicable to most java programs. This package contains standard java types like Integers and Strings as well as basic exceptions, math functions, system functions, threading and security functions.
java.util
A streamlined version of the java.util collection library. This package contains the collection classes like Vector and Hashtable. It also contains calendar and data classes.
External links
- CLDC homepage (http://java.sun.com/products/cldc/)