Java APIs

hi,
i am trying to get all the mac address of the localhost network interfaces.
here is my code. i don't seem to find what is wrong with it.

i will appreciate any help.
thanks

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

public class MAC {
	public static void main(String[] args) {
		try { 
			InetAddress[] addrs = null;
			if((addrs = InetAddress.getAllByName("localhost")) == null) System.exit(1);
			
			NetworkInterface ni = null;
			for(int i = 0; i < addrs.length; ++i) {
				if((ni = NetworkInterface.getByInetAddress(addrs)) == null) 	System.exit(2);

				

				byte[] mac = null;

				if((mac = ni.getHardwareAddress()) == null) System.exit(3);

				

				System.out.println(addrs[i]);

				System.out.println(new String(mac));

			}

		}

		catch(UnknownHostException e) { System.out.println(e.getMessage()); }

		catch(SocketException e) { System.out.println(e.getMessage()); }

	}

}
Edited by: BigJ___ on Sep 9, 2010 2:44 AM