How to excute commands in DOS ?

I want to execute DOS commands like "shutdown -i" in my Java application but I'm not able to get it done.
I've used the method as follows but it does not work(does not throw any exceptions as well):
try
Process child=Runtime.getRuntime().exec("shutdown -i");
catch(Exception e)
e.printStackTrace();
Also plz. shed some light on how to execute commands with multiple parameters like:
attrib -s -h -r "*.*" /s /d

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