/*测试本地主机IP地址*/
import java.net.*;

public class WhoAmI
{
    public static void main(String[]args)throws Exception
    {
            try
            {
                InetAddress ia=InetAddress.getByName(args[0]);
                System.out.println(ia);
            }catch(UnknownHostException e)
            {
                System.out.println(e.getMessage());
            }
    }    
}