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Java Archive (JAR) files allow developers to package many classes into a
single file. JAR files also use compression, so this can make applets and
applications smaller.
Creating a .JAR file is easy. Simple go to the directory your classes are
stored in and type :-
jar -cf myfile.jar *.class
If your application or applet uses packages, then you'll need to do things a
little differently. Suppose your classes were in the package
mycode.games.CoolGame - you'd change to the directory above mycode and type the
following :- (Remember to use / on UNIX systems)
jar -cf myfile.jar .\mycode\games\CoolGame\*.class
Now, if you have an existing JAR file, and want to extract it, you'd type the
following
jar -xf myfile.jar
Working with JAR files isn't that difficult, especially if you've used the
unix 'tar' command before. If you're planning on packaging an applet for
Internet Explorer, or an application for Microsoft's jview, you might also want
to consider .CAB files.
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