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发表于 2007-11-24 22:22:39
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A.概貌：
1. J2ME 、CLDC、 Configuration 、Profiles 和 Optional Packages
The Connected Limited Device Configuration (CLDC) is a fundamental part of the architecture of the Java 2 Platform, Micro Edition (J2ME). J2ME technology is delivered in API bundles called configurations, profiles, and optional packages. A J2ME application environment includes both a configuration like CLDC and a profile like the Mobile Information Device Profile (MIDP). In addition, optional packages provide capability in specific areas of functionality, such as wireless messaging and multimedia capture and playback. The ability to choose from among the various bundles enables product designers and developers to match software capabilities with hardware capabilities very closely. They can use APIs that give them easy access to the components a particular kind of device actually has, without the overhead of APIs designed for capabilities the device doesn't support.
The CLDC Configuration
A configuration provides the most basic set of libraries and virtual-machine features that must be present in each implementation of a J2ME 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.
Profiles
A profile is a set of standard APIs that support a narrower category of devices within the framework of a chosen configuration. A specific profile is combined with a configuration like CLDC to provide a complete Java application environment for the target device class. MIDP is a profile supported by CLDC. Together, they provide a rich run-time environment.
Optional Packages
An optional package is a set of technology-specific APIs that extends the functionality of a Java application environment. CLDC supports a number of optional packages that allow product designers to balance the functionality needs of a design against its resource constraints. CLDC-based optional packages include the Wireless Messaging API (WMA) and the Mobile Media API (MMAPI).
2. Sun JavaTM Wireless Toolkit for CLDC
a set of tools that makes it possible to create applications for mobile phones and other wireless devices. Although it is based on the Mobile Information Device Profile (MIDP) 2.1, the Sun JavaTM Wireless Toolkit for CLDC also supports many optional packages, making it a widely capable development toolkit.
我安装的其实是Sun JavaTM Wireless Toolkit for CLDC
用户手册：
http://java.sun.com/products/sjw ... html#50626611_14685
[ 本帖最后由 lanzinc 于 2007-11-24 22:24 编辑 ] |
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