A JAR file can be used as a class path entry, whether or not it is compressed. The jar command also allows individual entries in a file to be signed by the applet author so that their origin can be authenticated. The jar command also compresses files, which further improves download time. This dramatically improves download times. When the components of an applet or application (files, images and sounds) are combined into a single archive, they can be downloaded by a Java agent (such as a browser) in a single HTTP transaction, rather than requiring a new connection for each piece. However, the jar command was designed mainly to package Java applets or applications into a single archive. ![]() ![]() The jar command is a general-purpose archiving and compression tool, based on ZIP and the ZLIB compression format.
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