Calling jar -xvf

Hi - I am trying to unjar a jar file by calling the jar command "jar -xvf". My code is calling the jar command but is not unjaring the jar file. This is my code:
try{
Runtime r = Runtime.getRuntime();
Process p = r.exec("jar -xvf " + jardirectory + jarfile);
}catch(Exception e){System.out.println(e);}
Why is it not unjarring the Jar file? The only way I got it to unjar by calling a batch file that calls the jar command. I really want to unjar the file through Java, and not through a batch file. Thank you.
Seigot

see documentation for java.util.jar.* , esp. java.util.jar.JarFile

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