list network interfaces.

ListInterfaces.java

import java.net.NetworkInterface;
import java.util.Enumeration;

public class ListInterfaces {

  public static void main(String[] args) {
    try {
      Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
      while (interfaces.hasMoreElements()) {
        System.out.println("interface " + interfaces.nextElement().getName());
      }
    } catch (Exception e) {
      System.out.println(e);
    }
  }
}