running file from command line in windows

[Pouncer]

import java.io.*;

public class cw1 {
    
    public static void main (String args[]) throws IOException {
	System.out.println("fdfsdf");
	String blah = args[0];
	
	System.out.println(blah);
    }    
    
}

Basically, when i compile and run that (from the xemacas popup), it gives me an exception error:

fdfsdf
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at cw1.main(cw1.java:15)

Process cw1 exited abnormally with code 1

i need to run this by command line somehow, like
java cw1 hello
so args[0] will be hello and it shud print hello.

i hope someone with experience can help me. im on windows, using xemacs
with jdk1.5.0_05

my environment variables 'path' is set as
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Java\jdk1.5.0_05\bin;C:\Program Files\Common Files\GTK\2.0\bin