import java.net.*;
import java.util.Enumeration;

/**
 * This short program lists information about available network interfaces
 * on the computer on which it is run.  The name of each interface is
 * output along with a list of one or more IP addresses for that
 * interface.  The names are arbitrary names assigned by the operating
 * system to the interfaces.  The addresses can include both IPv4 and
 * IPv6 addresses.  The list should include the local loopback interface
 * (usually referred to as "localhost") as well as the interface
 * corresponding to any network card that has been installed and configured.
 */
public class ShowMyNetwork {

    public static void main(String[] args) {

        Enumeration<NetworkInterface> netInterfaces;

        System.out.println();

        try {
            netInterfaces = NetworkInterface.getNetworkInterfaces();
        }
        catch (Exception e){
            System.out.println();
            System.out.println("Sorry, an error occurred while looking for network");
            System.out.println("interfaces.  The error was:");
            System.out.println(e);
            return;
        }

        if (! netInterfaces.hasMoreElements() ) {
            System.out.println("No network interfaces found.");
            return;
        }

        System.out.println("Network interfaces found on this computer:");

        while (netInterfaces.hasMoreElements()) {
            NetworkInterface net = netInterfaces.nextElement();
            String name = net.getName();
            System.out.print("   " + name + " :  ");
            Enumeration<InetAddress> inetAddresses = net.getInetAddresses();
            while (inetAddresses.hasMoreElements()) {
                InetAddress address = inetAddresses.nextElement();
                System.out.print(address + "  ");
            }
            System.out.println();
        }

        System.out.println();

    } // end main()


}