102
Java™
-
The JAD file
-
The JAR file
JAD file stands for
J
ava™
A
pplication
D
escriptor. It is a small
file describing the content of a JAR file.
JAR file stands for
J
ava™
A
rchive. It refers to the application
data themselves (program, images, sound). A
JAR file can
have a size of up to 200 KB.
Note
:
In rare circumstances, MIDlet vendors may provide no
JAD file and the MIDlet is just the JAR file. In such a case it is
your sole responsibility to assess the risk of downloading the
JAR file without any possibility of consulting the JAD file.
Downloading a MIDlet (Java™ game or application)
MIDlets are easily downloaded to the mobile phone through
the Games or Applications menus or through the WAP
browser. In almost all cases, you will first receive a JAD file
which will be displayed on the screen.
When you select a JAD file, your mobile phone downloads it,
displays the data contained and prompts you to
acknowledge the JAR file download.
The popup displays information below:
-
Name of the MIDlet, Version, Size, Name, Security status,
URL.
If you do not want to download the main data (JAR file), you
can refuse to acknowledge further airtime consumption by
selecting "Cancel".
If you agree on the MIDlet installation, just select
OK
. The
MIDlet is installed with security levels set to the default values
associated with its security status.
Before downloading an application, a message similar to this
one may be displayed: "Your handset cannot identify the
application, please be sure of the source of the application
before installing the application".
