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Java archive
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file format, filename extension (jar) A compressed archive
file containing Java class files, filename extension:
".jar". The Java Development Kit contains a tool called
"jar" for creating .jar files, similar to the standard Unix
tar command. As well as archiving and compressing the Java
class files, it also inserts a "manifest" file which can
contain information about the class files, such as a digitalsignature. Combining class files into a single archive file
makes it possible to download them in a single HTTP
transaction. This, and the compression, speeds up execution
of Java programs delivered via the Internet.