Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Java Application Descriptor (JAD) files describe the MIDlets (Java ME applications) that are distributed as JAR files. JAD files are commonly used to package Java applications or games that can be downloaded to mobile phones. Java applications enable Mobile phones to interact programmatically with online web services, such as the ability to send SMS messages via GSM mobile internet or interact in multiplayer games. Some BlackBerry devices use JAD files for themes. Recent midlets contain a manifest file in the JAR archive. This file contains much of the information stored in the JAD file, rendering it unnecessary in most cases.

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