how to modified jar file

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Java

Hello can you please tell me how to modified (insert java file)the jar file .

and again make jar file

Thanks

Posted 8-Jan-13 0:26am

ravi1989h

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TorstenH. · Answer 1 · 2013-01-08T00:35:00

Solution 1

What Jar file?

A jar without code is setup the way it is for a reason. One should not change that.

But one often can extend that by using the Jar-file as a library in the app one creates.

Posted 8-Jan-13 0:35am

TorstenH.

Comments

ravi1989h 8-Jan-13 6:37am

Actually i have a jar file .i want to add some pluggin mean som e java file..how can it is possible..

TorstenH. 8-Jan-13 6:46am

extend it. That's the official way.
Inoffical - a jar file is nothing lese than a zip file.

ravi1989h 8-Jan-13 6:38am

jar file mean a library

Richard MacCutchan · Answer 2 · 2013-01-08T00:44:00

You can update jar files by adding new classes, just check the options for the jar command:

C:\Users\Richard\Documents\Java>jar -?
Illegal option: ?
Usage: jar {ctxui}[vfm0Me] [jar-file] [manifest-file] [entry-point] [-C dir] files ...
Options:
    -c  create new archive
    -t  list table of contents for archive
    -x  extract named (or all) files from archive
    -u  update existing archive
    -v  generate verbose output on standard output
    -f  specify archive file name
    -m  include manifest information from specified manifest file
    -e  specify application entry point for stand-alone application
        bundled into an executable jar file
    -0  store only; use no ZIP compression
    -M  do not create a manifest file for the entries
    -i  generate index information for the specified jar files
    -C  change to the specified directory and include the following file
If any file is a directory then it is processed recursively.
The manifest file name, the archive file name and the entry point name are
specified in the same order as the 'm', 'f' and 'e' flags.

Example 1: to archive two class files into an archive called classes.jar:
       jar cvf classes.jar Foo.class Bar.class
Example 2: use an existing manifest file 'mymanifest' and archive all the
           files in the foo/ directory into 'classes.jar':
       jar cvfm classes.jar mymanifest -C foo/ .