How to pass arguments to Jar

Hi All,
I have a jar file, called rp.jar, if I run java -jar rp.jar, it shows "Usage rp.jar c:/old c:/new", if I just run rp.jar, nothting shows in the command line? why?
in my main
if (2 != args.length) {
System.out.println("Usage: rp.jar c:/old c:/new");
return;
and how do run rp.jar, it will show "Usage rp.jar c:/old c:/new", thanks a lot
Edited by: huangpu on Jun 9, 2009 9:46 AM
Edited by: huangpu on Jun 9, 2009 9:50 AM
Edited by: huangpu on Jun 9, 2009 9:51 AM

I am just curious why
if I run java -jar rp.jar, it shows "Usage rp.jar c:/old c:/new",
if I run rp.jar, nothting shows in the command line? why?

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I for one have no idea what you're asking, and what you seem to be saying doesn't make sense.
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