### Question:
Pcaps { public static List<PcapNetworkInterface> findAllDevs() throws PcapNativeException { PointerByReference alldevsPP = new PointerByReference(); PcapErrbuf errbuf = new PcapErrbuf(); int rc = NativeMappings.pcap_findalldevs(alldevsPP, errbuf); if (rc != 0) { StringBuilder sb = new StringBuilder(50); sb.append("Return code: ") .append(rc) .append(", Message: ") .append(errbuf); throw new PcapNativeException(sb.toString(), rc); } if (errbuf.length() != 0) { logger.warn("{}", errbuf); } Pointer alldevsp = alldevsPP.getValue(); if (alldevsp == null) { logger.info("No NIF was found."); return Collections.<PcapNetworkInterface>emptyList(); } pcap_if pcapIf = new pcap_if(alldevsp); List<PcapNetworkInterface> ifList = new ArrayList<PcapNetworkInterface>(); for (pcap_if pif = pcapIf; pif != null; pif = pif.next) { ifList.add(PcapNetworkInterface.newInstance(pif, true)); } NativeMappings.pcap_freealldevs(pcapIf.getPointer()); logger.info("{} NIF(s) found.", ifList.size()); return ifList; } private  Pcaps(); static List<PcapNetworkInterface> findAllDevs(); static PcapNetworkInterface getDevByAddress(
    InetAddress addr
  ); static PcapNetworkInterface getDevByName(
    String name
  ); static String lookupDev(); static Inet4NetworkAddress lookupNet(
    String devName
  ); static PcapHandle openOffline(
    String filePath
  ); static PcapHandle openOffline(
    String filePath, TimestampPrecision precision
  ); static PcapHandle openDead(
    DataLinkType dlt, int snaplen
  ); static PcapHandle openDead(
    DataLinkType dlt, int snaplen, TimestampPrecision precision
  ); static BpfProgram compileFilter(
    int snaplen, DataLinkType dlt, String bpfExpression,
    BpfCompileMode mode, Inet4Address netmask
  ); static DataLinkType dataLinkNameToVal(
    String name
  ); static String dataLinkTypeToName(
    DataLinkType dlt
  ); static String dataLinkValToName(
    int dataLinkVal
  ); static String dataLinkTypeToDescription(
    DataLinkType dlt
  ); static String dataLinkValToDescription(
    int dataLinkVal
  ); static String strError(int error); static String libVersion(); static String toBpfString(InetAddress inetAddr); static String toBpfString(MacAddress macAddr);  }### Answer:
@Test public void testFindAllDevs() throws Exception { List<PcapNetworkInterface> devs = Pcaps.findAllDevs(); assertNotNull(devs); assertTrue(devs.size() != 0 || !System.getProperty("user.name").equals("root")); for (PcapNetworkInterface dev: devs) { logger.info(dev.toString()); } }