I’m discussing more about file extensions.  I have already discussed file extensions for computer files.  This time, I will discuss the file extensions being used on cell phones and other portable devices.

On these devices, the Small Java applications being used are called midlets.  File Extension JAD (Java Application Descriptor) is used in packaging midlets. To run the midlet, the File Extension JAD must contains the needed information, such as, the application name and size, the .jar file association, the vendor name, version number. The .jar file must contain the midlet’s application, the java .class files, and other resources like images. The File Extension JAD and the File Extension JAR must be used together. Otherwise, the packaged midlets would not work.

Installing File Extension JAD and the midlets is very simple. In most devices, the application installers will automatically download and install the files. There are some devices that require a computer to install the files into the device.

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